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Mon Apr 21 22:35:13 EDT 1997
Extensive revisions to the entire ampl/solvers tree, corresponding
to an updated "Hooking Your Solver to AMPL":
ftp://netlib.bell-labs.com/ampl/REFS/hooking.ps.gz
Tue Apr 22 07:56:07 EDT 1997
pfg_read.c pfghread.c: fix glitch that could cause a fault (during
setup for Hessian computations).
Thu Apr 24 12:46:31 EDT 1997
misc.c: fix a glitch in reading suffix tables (a forthcoming AMPL
extension).
Sun May 18 13:40:12 EDT 1997
Tweaks: use a replaceable "getenv"; augment r_opn.hd (for a
forthcoming driver); add rule for stderr.obj to makefile.*.
Thu May 29 23:20:52 EDT 1997
Fix bug with xknown() with problems involving defined variables:
derivatives were sometimes miscomputed.
Wed Jun 4 11:44:14 EDT 1997
Adjust struct psb_elem in psinfo.h (currently just for use
in lancelot/lancelot.c). Recompile amplsolver.a (or amplsolv.lib) from
scratch, even if you get just the updated files (asldate.c, pfg_read.c,
psinfo.h, xsum0.out).
Add file README.f77 with changes that permit using the native Fortran
77 compiler on some systems.
Tue Jun 17 22:29:37 EDT 1997
Fix a fault that was possible in the .nl readers when the .nl file
was written with presolve turned off.
Thu Jun 26 23:52:36 EDT 1997
Adjust Malloc and M1alloc so Malloc(0) and M1alloc(0) return nonzero
values even if malloc is buggy in that malloc(0) returns 0.
Wed Jul 9 14:55:48 EDT 1997
Adjust Realloc so Realloc(0,n) works analogously to Malloc(0).
New field n_eqn gives (in struct Edaginfo) gives the number of
equality constraints (if known from versions of ampl >= 19970627),
or -1. This change requires recompiling all of amplsolver.a and any
solver objects that #include "asl.h".
Tweak to reading numbers of complementarity constraints in .nl headers
(to be further documented later).
getstub.c: fix glitch that sometimes caused -? to say
"...[options] [options]..." rather than "...[options]...".
obj_prec.c: adjust to use getenv_ASL.
Mon Jul 21 12:33:08 EDT 1997
funcaddk.c: add missing line (AmplExports *ae = al->AE;) to function
mean.
Tue Jul 22 16:53:59 EDT 1997
func_add.c: ignore argtype = 6.
Thu Aug 14 00:34:10 EDT 1997
Adjust getstub.c and getstub.h to permit specifying that underscores
should be retained (rather than turned into blanks) in names passed to
a Solver_KW_func. An enum now names bits in the "flags" field, with
ASL_OI_want_funcadd (== 1) meaning that funcadd should be called, and
ASL_OI_keep_underscores (== 2) meaning that underscores should be kept.
Tue Aug 19 15:39:22 EDT 1997
pfg_read.c (and pfghread.c): fix bugs with linear defined variables
referenced by other linear defined variables. Example:
set I := 1..4;
var x{I} >= 0 := .25;
convex: sum{i in I} x[i] = 1;
var y = x[1];
var d = 1 + y;
s.t. zot{j in 1..2}: x[j] + d >= .1;
minimize foo: sin(x[1]);
led to an infinite loop. A more complicated example led to an assertion
failure. (Henceforth, compile pfghread.c and pfg_read.c with -DDEBUG
if you want the assertions checked.)
Wed Aug 20 16:11:24 EDT 1997
Once again, pfg_read.c (and pfghread.c): fix another bug with linear
defined variables that involve other linear defined variables, this time
when constant terms are involved. The constant terms sometimes got
lost. Example:
set I := 1..3;
var x{i in I} >= 0 := i;
var y = x[1];
var z = y + 1;
s.t. bletch: sum{i in I} x[i] + y + z == 2;
s.t. zap: sum{i in 1..2} x[i] + z == 2;
Fri Sep 12 01:09:37 EDT 1997
funcadd.c: for hypot(0,0), set the Hessian to all zeros.
mip_pri.c: change "AMPl" to "AMPL".
pfg_read.c (and pfghread.c):
1. Fix glitch affecting Hessian computations when imported
(user-defined) functions involve some constant arguments.
2. Fix more bugs in handling defined variables. Example:
var x0 >= 0 := 1;
var x1 >= 0 := 3;
var v2 = x1 - 2;
var v3 = v2 * x0 + 10.4; # the constant term 10.4
s.t. c: v3 = 0; # caused trouble
3. Fix bug in allocation of al->hes for imported functions:
constant arguments were not counted.
sphes.c: fix glitch in computing sparsity of Hessians when imported
functions are involved.
Fri Sep 12 18:51:41 EDT 1997
pfg_read.c (and pfghread.c): fix two glitches that caused faults with
certain models.
Fri Oct 10 17:13:14 EDT 1997
stdio1.h0: protect #define Char with #ifndef Char .
asl.h, jac0dim.c: change neqn to n_eqn (new field giving the number
of equations), to reduce the chance of name classes (such as occurred
in fsqp/fsqp.c). The comments above for 19970709 have been adjusted.
Sat Oct 11 16:32:51 EDT 1997
Add to README another pointer to makefile comments; update xsum0.out
(missed yesterday).
Thu Oct 16 13:47:06 EDT 1997
con1ival.c, con2ival.c: fix bug with congrd(n, i, x, g, nerror)
(Fortran 77 notation): if called with nerror < 0 at an (i,x) pair
at which conival was not called, no gradient was computed.
Thu Oct 23 20:09:51 EDT 1997
pfg_read.c pfghread.c: fix bug that could cause a fault on some
machines (e.g., HP).
Mon Nov 3 23:45:32 EST 1997
f_read.c fg_read.c fgh_read.c pfg_read.c pfghread.c: fix bug in
reading cvar array for complementarity constraints (to be further
documented later).
Fri Nov 7 03:41:23 EST 1997
Add variants of xknown() with apparent signatures
void xknowne(real *X, fint *nerror);
void xknowe_(real *X, fint *nerror);
that treat errors in evaluating common expressions the same way as
other routines (objval, conval, etc.) that have a final nerror argument.
Fri Nov 7 09:20:15 EST 1997
mip_pri.c nqpcheck.c: for simplicitly, back off changes early this AM
that made some arrays available to either free() or M1record(). Arrays
returned by these routines are freed automatically by ASL_free(&asl).
Tue Nov 11 16:25:21 EST 1997
misc.c: fix botch introduced 19971107: s/xknowe(/xknowne(/
asl.h misc.c: change M1record to a Char** function, permitting one
to Realloc or free the recorded memory block if one updates or zeros
*(the return value from M1record) accordingly.
Tue Dec 2 23:50:40 EST 1997
README.f77: point out need to remove -lf2c (references to libf2c.a)
when using native Fortran compilers.
Tue Jan 13 22:45:01 EST 1998
nqpcheck.c: if called with NULL for any of rowqp, colqp, or delsqp,
omit changes that require adding quadratic-term contributions to
the return values of objval, conval, and conival (as is done by
function qterm in examples/qtest.c).
Wed Jan 14 08:49:00 EST 1998
jac0dim.c: tweak (to treatment of Arith_Kind_ASL) foreshadowing
forthcoming changes.
Wed Feb 4 13:25:05 EST 1998
jac0dim.c: adjust jacdim variants to assume stub is null-terminated
if stub_len <= 0. (This slightly simplifies invocations of these
routines, as it removes the need for a strlen call, and though choosing
file names with blanks in them is a very bad idea, this change permits
blanks in the "stub".)
Wed Feb 11 15:10:54 EST 1998
.nl file readers: fix a fault that was possible with certain
nonlinear .nl files generated with "option presolve 0".
Wed Mar 25 23:26:13 EST 1998
con1ival.c, con2ival.c: fix bug in handling nerror when a gradient
is requested at a point different from the one where the constraint
was most recently evaluated. The bug caused wrong gradients to be
returned (the input G was unchanged).
misc.c: fix glitch in Realloc's checking for a null return.
Many routines: minor updates; new facilities for receiving and
transmitting user-defined suffixes (to be described later). On most
systems, nonlinear solvers should no longer link with funcadd0.o, but
rather should link automatically with funcadd1.o, which is now in
amplsolver.a. Exceptions: under MSDOS and AIX earlier than AIX 4.2,
nonlinear solvers should still link with funcadd0.o (or otherwise,
as indicated in the funclink subdirectory).
Thu Mar 26 18:03:37 EST 1998
New file funcaddr.c, for compiling funcadd1.c so as to release
amplfunc.dll when ASL_free() is called, rather than at the end of
execution. This is for use with shared libraries that may be loaded
and unloaded repeatedly during a single program execution, such as
MATLAB mex files. Use of funcaddr.c is now illustrated in the rules
for amplfunc.mex and spamfunc.mex in examples/makefile.
Fri Mar 27 14:40:16 EST 1998
getstub.c: minor tweak for what now should be an unusual case:
statically linking a funcadd.o with the solver.
Mon Mar 30 16:43:25 EST 1998
asl.h: make solve_result_num a synonym for asl->i.solve_code_, the
value that appears in AMPL sessions as solve_result_num.
Thu Apr 2 17:36:57 EST 1998
func_add.c: if -ix is not given, assume -i$AMPLFUNC .
Mon Apr 6 16:09:37 EDT 1998
qp_read.c: fix bug in qp_opify()'s handling of min(...) and max(...)
expressions.
Fri Apr 10 23:16:08 EDT 1998
makefile: add funcaddr.c to xsum.out.
Fri May 8 11:33:00 EDT 1998
funcadd1.c: permit compiling with (e.g.) -DFUNCADD="funcadd_ASL_"
to change the name sought in amplfunc.dll from "funcadd_ASL" to
"funcadd_ASL_". Unless compiled with -DNO_DLOPEN_ERROR_MESSAGE,
print a warning (on Stderr) when -i or $AMPLFUNC is specified
and the library does not exist or cannot be loaded. On systems
that provide a dlerror() function that returns a string explaining
what went wrong, print that string. (Compile with -DNO_DLERROR if
dlerror() is buggy, as it is, e.g., in at least one older version
of Linux).
makefile.wat: compile funcadd1.c with -DFUNCADD="funcadd_ASL_" .
If you use non-default calling conventions, you may have to adjust
this detail.
Tue May 12 19:00:35 EDT 1998
dtoa.c: fix a glitch introduced with the scaling of 19970212
that caused one-bit rounding errors in certain denormal numbers, such
as 8.44291197326099e-309, which was read as 8.442911973260987e-309.
funcadd1.c: tweak to prevent undesired complaint of missing
amplfunc.dll with -DWIN32.
arithchk.c and makefiles: determine whether long long is available.
Fri May 15 16:46:18 EDT 1998
dtoa.c: tweak to round 2.2250738585072012e-308 correctly.
f_read.c fg_read.c: tweak so f_read does not pull in r_ops_ASL.
Tue May 26 13:16:50 EDT 1998
objconst.c: correct glitch in use with pfg_read and pfgh_read.
Note that objconst(n) returns 0 if objective n is not affine.
Wed May 27 16:48:25 EDT 1998
objconst.c: add a missing #undef f_OPNUM; asldate.c not changed.
Thu Jun 18 01:13:10 EDT 1998
Fix possible fault in, e.g., sphes(), with certain uses of defined
variables. The fix involves a data structure change, so it is best
to recompile all of amplsolver.a and any objects that include the
solver interface header files.
Adjust xectim.c to use getrusage() on Unix systems (for CPU time
resolution of 1 microsecond).
Fri Jun 19 18:52:08 EDT 1998
Fix typo in comments in funcadd.h (about where to store partials).
arithchk.c: add logic for detecting IEEE-like arithmetic that
flushes underflows to 0 (a bad thing).
Wed Jun 24 16:33:55 EDT 1998
funcadd.h: type of Errmsg changed from Char to char.
rops.c, rops2.c: explicitly check for sqrt(negative number) rather
than relying on errno being set to indicate this. There exists at
least one systems where this matters.
Fri Jun 26 08:55:38 EDT 1998
funcadd1.c: minor tweak for compilation under SunOS 4.1x; asldate.c
not changed.
Tue Jul 14 14:43:13 EDT 1998
pfg_read.c pfghread.c: discard linear terms that end up with a
coefficient of 0. This is mostly invisible, but can avoid a division
by 0 (in pfg_read or pfgh_read) in certain complicated examples.
Thu Aug 27 07:51:38 EDT 1998
conpval.c pfg_read.c pfghread.c: fix bug in handling two or more
constraints (or objectives) involving a sum of monadic functions of
the same linear combinations of variables. This only affected
problems read with pfg_read() and pfgh_read(). Example:
var x;
s.t. zap{i in 1..2}: sqrt((x - i)^2 + 1) >= 0;
(In this example, zap[2] was miscomputed.) Also, fix faults in some
contexts in handling "constant" arguments of the form (e.g.) x-x for
some variable x.
Mon Aug 31 17:52:08 EDT 1998
pfg_read.c pfghread.c: "invisible" tweak to eliminate complaints of
"cast to pointer from integer of different size" on some machines.
Thu Sep 3 09:27:57 EDT 1998
Add comments about -DNANCHECK and -DNO_ERRNO to README.
Wed Oct 14 00:30:21 EDT 1998
getstub.[ch]: new bit ASL_OI_never_echo for Option_Info.option_echo
suppresses echoing of options (should it be desirable to scan them
twice).
New bits ASL_find_c_class, ASL_find_o_class, and their union
ASL_find_co_class in the flags argument to pfg_read() and pfgh_read()
instructs them to compute four new fields of ((ASL_pfg*)asl)->I
and ((ASL_pfgh*)asl)->I classifying objectives and constraints
as constant (0), linear (1), quadratic (2), or general nonlinear 3
(fields c_class and o_class) and giving the maximum values of these
arrays (max_c_class and max_o_class).
New field nlvog of struct Edaginfo; objgrd(np,x,g,ne) sets g[i] = 0
if the objective does not depend on x[i] and i < nlvog (or
i < max(c_vars, o_vars) if nlvog is left at 0); nlvog must be set
before the .nl reader is called. This matters to minos and snopt,
whose drivers have been updated to specify asl->i.nlvog = nlvo.
Fri Oct 30 01:50:47 EST 1998
Fix botch in handling first derivatives of user-defined functions
having some numeric constant arguments and some arguments involving
variables: if the total number of numerical arguments was more than 8,
unpredictable behavior was possible.
Fix bug in dtoa.c's handling of non-IEEE arithmetic machines,
such as SGI machines executing -n32 and -64 (but not -o32) binaries,
that flush underflows to zero instead of underflowing gradually.
Fri Nov 6 14:49:37 EST 1998
dtoa.c: tweak to remove LL suffixes from numeric constants (for
compilers that offer a 64-bit long long type but do not recognize the
LL constants prescribed by C9x, the proposed update to the ANSI/ISO C
standard). Thanks to Earl Chew for pointing out the existence of such
compilers. This change should be invisible on most systems.
Thu Nov 19 10:41:10 EST 1998
xectim.c: adjust so compilation with -DNO_RUSAGE will use CLK_TCK
if available (on Unix systems, in limits.h).
Tue Nov 24 23:32:33 EST 1998
names.c: fix glitch in obj_name(): when no .row file was present,
obj_name(n) overwrote con_name(n).
Wed Dec 9 10:11:12 EST 1998
README.SGI added describing how to restore IEEE arithmetic under
SGI's -n32 and -64 compilation modes.
Tue Dec 15 19:29:17 EST 1998
conpval.c: with readers pfg_read and pfgh_read, objgrd(nprob,x,g,ne)
was treated as objgrd(0,x,g,ne).
conpval.c, obj2val.c, objval.c: calls on objgrd(nprob,x,g,ne) for
several nprob values and the same x might have given wrong gradients
after the first call for that x.
pshvprod.c: fix rarely seen bug in Hessian computations involving
defined variables; a couple of operators that should have been +=
were simply = in defined variables whose value was the product of
two or more variables, at most one of which was fixed by presolve.
Example:
var w := 3; var x = 1;
var y = w*x; var z = w*y;
minimize zot: z; # w^2
sphes.c: fix possible fault when sphsetup() is called a second time.
Wed Jan 13 11:32:45 EST 1999
README: add new final paragraph about make invocations.
Update xsum0.out (missed copying this file on 19981215).
Tue Jan 19 01:08:35 EST 1999
New source file suf_sos.c helps use SOS suffixes (to be documented).
Changes to asl.h (and several other source files) require all of
amplsolver.a (or amplsolv.lib) to be recompiled.
Tue Jan 19 11:28:11 EST 1999
suf_sos.c: add missing #ifdef KR_header stuff; asldate.c not changed.
Mon Feb 1 17:50:46 EST 1999
suf_sos.c: fix botch in adjusting incoming integer-valued suffixes.
amplsolv.lbc, amplsolv.sy: add suf_sos.obj.
Sat Feb 6 17:55:09 EST 1999
asl.h: SufDesc: union u changed to struct u to facilitate debugging;
amplsolver.a must be recompiled.
suf_sos.c: enhanced to process suffixes .sosno and .ref (which can
be set explicitly with let commands) as well as the .sos and .sosref
suffixes supplied implicitly by AMPL (e.g., when it linearizes
piecewise-linear terms). Each distinct nonzero .sosno value
designates an SOS set, of type 1 for positive .sosno values and
of type 2 for negative values. The .ref suffix contains corresponding
reference values. Solvers calling suf_sos() must now declare all of
the above mentioned suffixes. See, e.g., suftab and the suf_sos()
invocation in solvers/cplex/cplex.c.
Fri Feb 12 16:53:49 EST 1999
misc.c: zero SufDesc field u.i in suf_declare (required by changes of
19990206).
writesol.c: under "g" (ASCII) format, cope with empty lines in the
solution message. (Sensible solver drivers do not have such lines.)
Fri Mar 19 08:42:14 EST 1999
asl.h: comments about ASL_reader_flag_bits added.
suf_sos.c: trivial change; asldate.c not updated.
Fri Apr 9 00:44:19 EDT 1999
pfg_read.c pfghread.c: fix a bug (fault or worse) that bit under
complicated conditions.
readsol.c: fix a bug in handling some incomplete .sol files.
funcadd.h: new entry Qsortv in AmplExports, plus declarations for
handling AMPL tables (a forthcoming extension).
func_add.c: add dummy Add_table_handler and Crypto routines (for
funcadd() routines that do not check that ae->asl is nonzero before
calling these routines, which are meaningful only to AMPL).
New routine fpinit(), called by jac0dim, to initialize the floating-
point arithmetic if necessary (e.g., on Intel and SGI systems).
asl.h, dtoa1.c: rather than redefining strtod (which causes some
systems to complain), #define strtod strtod_ASL.
Readers: call qsortv rather than qsort (so just one efficient qsort
need be loaded).
qp_read.c: "invisible" tweak to banish a compiler warning.
Mon Apr 12 15:38:16 EDT 1999
writesol.c: fix a bug introduced in the changes of 19990206 that
could erroneously cause a "sos" suffix to be written to the .sol
file (when, e.g., nonconvex piecewise-linear terms are present) and
might have caused some other suffixes not to be returned.
Thu Apr 15 15:56:04 EDT 1999
qp_read.c: the change on 19990409 was not invisible on machines with
64-bit pointers. Today's change should correct this mistake.
Mon Apr 19 16:49:19 EDT 1999
asl.h, jac0dim.c, sjac0dim.c, makefile*, amplsolv.*, studchk0.c: new
routine student_check_ASL(ASL *asl) (whose default version, in
studchk0.c, does nothing and whose "standard" alternative, in
sjac0dim.c, is equivalent to the old sjac0dim.c and limits problems
to 300 variables and 300 constraints), is a routine one can modify
to impose restrictions on "student" binaries.
Tue Apr 20 17:48:40 EDT 1999
mip_pri.c: account for adjustments by suf_sos(). Note that we now
recommend use of the .priority suffix rather than mip_pri().
printf.c: "invisible" tweak (introduction of stdout_fileno_ASL).
Wed Apr 28 10:44:10 EDT 1999
pfg_read.c, pfghread.c: fix bug reading problems with defined
variables that can be split into sums of terms. Incorrect gradients
or a fault during reading were possible. Example:
var x{i in 1..4} := i;
var y{i in 1..2} = sum{j in 2*i-1..2*i} j*x[j];
var z = y[1] / y[2];
var w = sum{i in 1..3} x[i]*x[i+1]; # splits
s.t. zot: z^2 <= 3; # gradient was miscomputed
s.t. zap: w >= x[3] + 1;
suf_sos.c: honor Fortran: take asl->i.Fortran_ into account when
adjusting A_colstarts and A_rownos, and add Fortran = asl->i.Fortran_
to each number in sosbeg and sosind (in analogy with A_colstarts and
A_rownos).
names.c, writesol.c: take variables and constraints eliminated by
suf_sos() into account (in the case of writesol, when wantsol bits 2
and/or 4 are one: the eliminated entities were already accounted for
in the .sol file).
Thu Apr 29 11:52:14 EDT 1999
makefile.wat: add a backslash (missed in the changes of 19990415).
Fri Apr 30 13:59:40 EDT 1999
nqpcheck.c: fix possible fault. (Absent a fault, the bug was
harmless).
New sigcatch_ASL() will catch various Unix signals and call
mainexit_ASL() and permit routines registered with atexit() to
be called when the solver is terminated by SIGABRT, SIGQUIT, SIGTERM,
or SIGHUP (unless SIGHUP is being ignored when sigcatch_ASL() is
called).
Fri May 21 17:20:01 EDT 1999
qp_read.c: fix bug in qp_opify's handling of imported functions.
readsol.c, rops.c, rops2.c: add some fflush(Stderr) calls.
makefile: renamed makefile.u, so one can copy the appropriate
makefile.* to makefile, then edit makefile.
printf.c, mainexit.c: for use by GUIs, compilation with -DPF_BUF of
amplsolver.a (or amplsolv.lib) and of solver interfaces causes
fprintf(stderr_ASL,...) to be accumulated in pfbuf_ASL (which is
allocated at the first relevant fprintf call and extended if necessary)
and, if pfbuf_print_ASL is not null, fflush(stderr_ASL) causes
pfbuf_print_ASL(pfbuf_ASL) to be called and pfbuf_ASL then to be freed.
Tue Jun 1 23:46:49 EDT 1999
Tweaks for -DKR_headers; have equ_adjust() operate independently
of the presolve setting.
Thu Jun 3 14:19:03 EDT 1999
makefile.u: correct comment about AIX to "for AIX versions < 4.3".
Sat Jun 5 16:24:52 EDT 1999
pfg_read.c, pfghread.c: fix possible fault or worse during gradient
computations of an objective or constraint that makes nonlinear use
of a linear defined variable that depends on other (necessarily
linear) defined variables that do not otherwise appear in the
objective or constraint. Example:
var x{i in 1..2} := i + 1;
var y = 1 - x[1]; # linear defined variable
var z = y + 5; # linear def. var., depending on y
s.t. c: z*x[2]*(3 + 4*x[2]) = 0; # nonlin. use of z
conpval.c: fix bug in Jacobian computations after pfgh_read():
if a common expression appeared in two terms, one involving more
variables than the other, then the common expression's contribution
to first derivatives was counted twice. Example: (x[1] + x[2] + 1) in
var x{i in 1..4} := i + 1;
s.t. c: (x[1] + x[2] + 1)*x[2] == (x[1] + x[2] + 1)*x[3]*x[4];
Thu Jun 17 11:42:59 EDT 1999
func_add.c: minor cosmetic changes that only matter to pure C++
compilers; asldate.c not changed.
Thu Jun 17 18:41:38 EDT 1999
rops.c, rops2.c: fix botch in "and" and "or" expressions (appearing
in the condition expression of nonlinear "if" expressions): the first
argument was passed as argument to the second operator.
Fri Jun 25 17:50:51 EDT 1999
funcadd1.c: fix a (previously harmless) type error.
names.c: fix a bug in obj_name().
printf.c: add #ifdef USE_ULDIV logic for use on DEC Alpha machines
running some versions of OSF1.
readsol.c: capture solve_result_num.
Wed Jun 30 16:12:12 EDT 1999
pfghread.c: fix more bugs with linear defined variables.
Very simple ones were sometimes mishandled. Example:
# Jacobian matrix was miscomputed after pfgh_read()
var x := 1; var a = x; var b = 1 - a;
s.t. c: b*(x/x) - 3*b = 1;
Another example (different bug) with simple defined variables
in which the Jacobian matrix was miscomputed after pfgh_read():
var x := 1; var y := 2; var z := 1;
# variant: fix z;
var v2 = z*y;
var v3 = 1 - y;
var v4 = v3;
var v5 = x + v2;
var v6 = (x + v2) / v5;
var v7 = v4 / (v3+5);
s.t. c: v6 + v7 = 1;
readsol.c: "invisible" tweak (banish harmless warnings).
Fri Jul 9 08:34:57 EDT 1999
xp2known.c: Fix a bug in computing constraint and objective values
after pfgh_read() with certain uses of very simple defined variables.
The bug is related to the one illustrated in the second example of
19990630, but not revealed by that example (but by a more complex one).
Wed Aug 4 09:02:13 EDT 1999
xp1known.c: make changes analogous to those to xp2known.c on 19990709.
(This is for completeness; we know of no solver using this routine.)
obj2val.c: omit an unnecessary "extern int errno;"; errno.h should
provide this (or the equivalent).
func_add.c, funcadd1.c: unless there is a command-line -i option,
look first in $ampl_funclibs for imported functions; if $ampl_funclibs
is not available, look (as before) in $AMPLFUNC. Starting with version
19990804, AMPL sets $ampl_funclibs to the full pathnames of the
libraries from which functions in the current problem instance were
imported. Now -i, $ampl_funclibs, or $AMPLFUNC may contain a newline-
separated list of directories and file names, and the names may contain
internal spaces.
funcadd.h: new fields in struct TableInfo have no affect on the
solver interface library.
Thu Aug 5 17:42:21 EDT 1999
funcadd1.c, func_add.c: modify -i? output to tell about $ampl_funclibs
(and change some calling sequences).
Thu Aug 12 21:12:29 EDT 1999
Minor tweaks...
funcadd1.c: remove an unused variable.
asl.h, jac0dim.c, stderr.c: provide for ill-advised systems (e.g.,
Red Hat Linux 6.0 for the DEC Alpha) in which static initializations
for the form "FILE *foo = stderr;" do not work: compiling the solver
interface library with -DNON_STDIO omits this sort of initialization,
which is replaced by a call on Stderr_init_ASL() in jac0dim(). Of
course, solvers that wish to do something with Stderr before
jac0dim has been called will have to first manually invoke (or do the
equivalent of) Stderr_init_ASL() when used on such inconvenient
systems.
fpinit.c: tweak to compile under Red Hat Linux 6.0 for the DEC Alpha.
For older DEC Alpha versions of Linux, it may be necessary now to
compile fpinit.c with -DUSE_setfpucw .
Mon Sep 27 17:13:14 EDT 1999
func_add.c, funcadd1.c: remember imported libraries and recall them
at any .nl-reader calls after the first (unless compiled with
-DCLOSE_AT_RESET). This became necessary after the changes of 19990804.
getstub.c, misc.c: add more calls on Stderr_init_ASL (cf the previous
changes).
Fri Oct 1 11:00:21 EDT 1999
con[12]ival.c, objval.c: remove redundant #include "errno.h".
rops.c, rops2.c, errchk.h: when errno is nonzero, add its
interpretation to error messages for library functions whose
evaluations fail. (This may help detect spurious setting of errno.)
Thu Oct 7 18:01:56 EDT 1999
rops.c, rops2.c: clear errno after calling an imported function.
fg_read.c: "invisible" tweak to use op_type.o rather than op_type.hd.
makefile.*: try to get dependencies right and omit obsolete names.
Thu Oct 14 00:26:12 EDT 1999
Tweaks to many files:
1. Move errno = 0 assignments before x...check() calls, as these calls
may evaluate common expressions.
2. Setting want_xpi0 |= 4 causes havex0 and havepi0 to be allocated
when primal and dual initial guesses are present.
3. New, experimental routine fg_write can write a binary or ASCII .nl
file, possibly adding new linear variables, constraints, objectives;
normally used with new reader fg_wread(), a variant of fg_read()
which, like qp_read(), leaves operation numbers rather than function
pointers in the "op" fields. (A subsequent call on qpopify() can
make it possible to evaluate nonlinear expressions, but fg_write
requires the operation numbers.) New examples/nlcopy.c illustrates
use of fg_wread and fg_write.
4. New bits in the flag argument to the .nl readers:
ASL_keep_all_suffixes
ASL_omit_all_suffixes
ASL_keep_derivs
ASL_allow_missing_funcs
ASL_forbid_missing_funcs
The first can be used by any reader (but is mostly for fg_wread);
the latter are only for fg_wread.
Fri Nov 19 16:55:10 EST 1999
xectim.c: where possible, return the sum of user and system time,
rather than just user time. On systems with slow software for
gradual underflow, it is possible to contruct examples where this
makes a significant difference in the reported times.
Mon Dec 13 17:00:00 EST 1999
fpinit.c: tweak for Linux (e.g., S.u.S.E. 6.3, Red Hat 6.0);
asldate.c not changed.
Wed Dec 15 13:30:46 EST 1999
dtoa.c, dtoa1.c: tweak to bypass a bug with HUGE_VAL on HP systems.
Thu Feb 3 23:18:24 EST 2000
funcadd.h: new fields in AmplExports.
asl.h and several *.c files: struct Edaginfo now has a pointer to
an AmplExports, rather than the complete structure, so that future
additions to AmplExports will not require recompiling everything.
This change does require make recompiling the whole library necessary,
as well as any solver objects that depend on asl.h or funcadd.h.
New variant fpinitmt.c of fpinit.c for Win32 binaries; makefile.*
adjusted.
Thu Feb 10 17:31:13 EST 2000
pfg_read.c, pfghread.c: fix a bug (division by zero resulting in NaNs)
that arose in a complicated use of defined variables.
sphes.c: fix a probably harmless reference to an uninitialized
variable.
Wed Feb 16 19:13:18 EST 2000
nqpcheck.c: adjust to cope with <<0;0,0>>x*x with AMPL
versions < 20000216, which gave 0*x*x rather than 0.
Thu Feb 17 18:21:17 EST 2000
pfg_read.c, pfghread.c: fix a bug in handling sums of three or more
terms each involving a nonlinear expression with a sum of three or
more terms. The bug caused a surprising error message in the example
that led to finding the bug, but could cause unpredictable behavior in
general.
Sun Mar 5 22:07:29 EST 2000
objval.c: fix bug in evaluating defined variables: defined variables
appearing only in single constraints were evaluated during objective
function evaluations; under unusual conditions, this could lead
to an error being reported in the evaluation of the objective.
pfg_read.c, pfghread.c: fix some bugs in Jacobian and Hessian
evaluations involving a defined variable that is an affine function
(linear function plus constant) of a single problem variable.
makefile.u: comment on -DNON_STDOUT.
func_add.c: add #ifdef NO_tempnam lines for systems without a
tempnam function.
Mon Mar 6 12:35:27 EST 2000
pfg_read.c, pfghread.c: minor "invisible" tweak to recycle a bit more
memory.
Wed Mar 8 13:49:57 EST 2000
Fix minor printf glitch:
printf "%.0f\n", .1;
printed "0." rather than "0" -- under "%.0f", numbers less than 1
in absolute value that do not round to 1 or -1 should print as "0"
with no trailing decimal point.
Wed Mar 15 12:42:05 EST 2000
pfg_read.c, pfghread.c: fix another botch with linear (affine)
defined variables: scaling was lost in linear references. For
example, in
var x; var y = 3*x; s.t. zot: sin(x) - 4*y == 1;
the factor (-4) in zot was lost.
asl.h, con1ival.c, con2ival.c, con2val.c, conpval.c, conval.c,
obj2val.c, objval.c: tweaks to avoid redundant work with some
combinations of calls.
fg_write.c, readsol.c: "invisible" cleanups.
Fri Mar 17 22:46:32 EST 2000
arithchk.c, makefile.*: On Unix/Linux systems, account for the
effects of fpinit_ASL when deriving arith.h. On SGI systems using
the n32 or 64 ABI, this causes Sudden_Underflow not to be #defined.
Sat Mar 18 23:22:24 EST 2000
func_add.c: fix bug introduced 19990804 in handling imported
functions when two or more .nl readers are called. (This affects
loqo, which may call both qp_read and pfgh_read.)
Mon Mar 20 16:55:45 EST 2000
Minor tweaks for compilation with -DKR_headers (files asl.h,
fg_read.c, fg_write.c, func_add.c, funcadd1.c).
Mon Mar 27 01:33:59 EST 2000
pfg_read.c, pfghread.c: fix bugs in handling defined variables in
certain complicated situations (e.g., on Vanderbei's hs090.mod). One
bug arose under AMPL's "option linelim 1".
Tue Mar 28 11:20:09 EST 2000
pfg_read.c, pfghread.c: fix glitch with nonlinear "if" expressions
with constant "then" or "else" expressions and with "min" or "max"
expressions having a constant operand: a fault was possible during
expression evaluations (after reading).
Tue Apr 4 11:52:52 EDT 2000
pfg_read.c, pfghread.c: fix yet another bug with defined variables:
if a nonlinear defined variable appeared linearly in an objective and
could be split into several terms, each depending on a different set
of variables, and if linear combinations of variables appeared
nonlinearly, incorrect derivative computations could result.
Thu Apr 27 19:17:20 EDT 2000
New field AI of type AuxInfo* in AmplExports. It can be assigned
by auxinfo_ASL() to provide general kinds of auxiliary information.
The (new) default auxinfo_ASL in amplsolver.a (amplsolv.lib) simply
assigns AI = 0, but solvers can provide their own auxinfo_ASL to
provide more interesting values.
opcode.hd moved from directory ampl/solvers/nlc to ampl/solvers
for more convenient use by other solver drivers.
Wed May 3 07:53:14 EDT 2000
New subdirectory lbfgsb with an interface to L-BFGS-B, which
minimizes or maximizes a differentiable objective subject only to
simple-bound constraints. See Algorithm 778, ACM Trans. Math.
Software 23 #4 (1997), by Ciyou Zhu, Richard Byrd, Peihuang Lu,
and Jorge Nocedal.
Fri Jun 2 08:57:49 EDT 2000
fpinit.c: new section for Solaris on i386 machines.
New fpsetprec.s for use with fpinit.c on Solaris i386 systems.
getstub.c: "invisible" tweak for readability.
pfg_read.c pfghread.c: fix some bugs with defined variables:
definitions of the form
var x = if something then 1 else 2;
where both the "then" and "else" clauses were constant almost
everywhere were mishandled, and
definitions that could be split apart (while identifying
partially separable structure) were sometimes mishandled.
Here is an example that caused a fault in pfgh_read():
var a := 0; var b := 2; var c := 3;
var x = if 2 <= a then 2 else b + c;
var y = if 2 <= a then 0 else -2;
var z = 2*x + y^2;
minimize zot: z;
Thu Jun 8 19:13:13 EDT 2000
func_add.c, funcadd.h: new ae->Getenv and #define for
char* getenv(const char*)
mainly for use in AMPL sessions to let imported functions and table
handlers access the current environment (as modified by option,
environ, and problem commands). Only use getenv in imported
functions (in the form (*al->Getenv)) if ae->ASLdate >= 20000608.
func_add.c: fix glitch that could result in "_fileno" reported as
missing on some systems.
Mon Jul 3 11:44:29 EDT 2000
Tweak to fpsetprec.s for use with fpinit.c on Solaris i386 systems.
(Adjust stack to allow interrupts to intervene in fpsetprec().)
asl.h, basename.c, getstub.c: change "basename" to "basename_ASL",
to avoid (rare) trouble on hostile systems.
rops.c, rops2.c: "invisible" tweak (change "round" to "Round") to
avoid trouble on other hostile systems.
Fri Jul 7 08:40:36 EDT 2000
funcadd1.c: when loading a library to import functions, arrange for
subsequent unloading of the library to happen after any at_exit() or
at_reset() processing requested directly or indirectly by addfunc().
(This matters to an experimental facility for importing Java functions.)
der0prop.c withdrawn (unused).
Various files: adjustments to permit compilation by C++ compilers.
Thu Jul 20 11:03:28 EDT 2000
basename.c: omit an 0x01 visible under -DKR_headers, introduced
on 20000707.
pfg_read.c, pfghread.c: fix bug in handling nonlinear defined
variables that appeared linearly in an objective or constraint and
involved the sum of two or more terms involving different sets of
variables (so they could be split into a sum of defined variables
to make Hessian computations more efficient). If introducing a
linear change of variables also helped and was discovered at the
"right" time, incorrect derivative computations resulted. Example:
var x{i in 0..2} := .1;
var v3 = 1 / x[0];
var v4 = x[1] + 5*x[2];
var v5 = v3 - x[1]*v4;
minimize foo: v5 + x[2]*v4;
Correcting this bug involved changing one line from
ce->z.i = ka;
to
ce->z.i = k < Ncom ? ka : ((expr_vx*)varp[k-Ncom])->a0;
but today's changes also include an "invisible" adjustment to the
a1 field of struct expr_vx.
Thu Jul 27 21:41:42 EDT 2000
Extend comments in makefile.u about Solaris on the i386 architecture.
Thu Aug 3 13:44:35 EDT 2000
funcadd1.c: mostly invisible addition of "#undef mymalloc".
jac0dim.c, misc.c: move Stderr_init call to ASL_alloc() (a change
invisible on most systems, but relevant to some solvers, such as cplex,
on some Linux systems, if the solver issues an error message too soon).
getstub.c: usage_ASL(): call Stderr_init if necessary.
Tue Aug 22 23:36:17 EDT 2000
New genrowno.c defining gen_rownows_ASL (#defined as usual to
apparent prototype void gen_rownos(void)): solvers that handle sparse
nonlinear constraints and wish to have Jacobian nonzeros stored
sparsely by columns in A_rownos may simply call gen_rownos() after
calling the .nl reader (with A_vals left at its default value = NULL).
Mon Aug 28 14:32:32 EDT 2000
pfg_read.c, pfghread.c: fix bug on systems with 64-bit addresses
that caused, e.g., miscomputation of gradients with problem "hs105"
(/netlib/ampl/models/nlmodels/hs105.mod).
Wed Aug 30 01:11:01 EDT 2000
pfg_read.c, pfghread.c: fix a bug with pfgh_read(nl, flags) when
one or both of the ASL_find_co_class bits of flags is on: wrong
c_class or o_class values (or a fault due to an out-of-bounds
subscript) could result if the bug bit.
All readers: fix bug (out-of-bounds array reference) in some
cases when asl->i.nlvog has been assigned a positive value.
(Of the sample drivers in /netlib/ampl/solvers subdirectories,
only minos/m55.c and snopt/snopt.c do this.)
jac0dim.c jacinc.c: adjust x0len to only consider nonlinear
variables when deciding whether nonlinear information must be updated.
Tue Sep 5 13:17:01 EDT 2000
pfg_read.c, pfghread.c: fix a bug in computing derivatives that
arose under complicated conditions: a defined variable could be
split into the sum of two or more defined variables and appeared
in an expression complicated enough that "funneling" the expression
led to more efficient derivative computations. Example:
var x{1..2} >= .6 <= 1 := 1;
var y{i in 1..2} = .5*x[i] + 1;
var z{i in 1..2} = .25*y[i] + 3;
var w = (1 + (y[1] - y[2])^2) / z[2] # split
+ (y[1] - 7) / z[1];
s.t. zot: w + x[1] + x[2] == 0; # first term of w funneled
Tue Sep 12 15:38:38 EDT 2000
nqpcheck.c: for constraints, when a quadratic form involves a
constant term, update the constraint upper and lower bounds rather
than adjusting the value of the constraint body.
Mon Oct 2 15:45:39 EDT 2000
pfg_read.c, pfghread.c: fix bug only possible with inappropriate
use of "option presolve 0" resulting in constant "defined variables".
All nonlinear .nl readers: fix botch in computing bounds (LUrhs,
Urhsx) on constraints involved in complementarity conditions. The
bounds were supposed to be redundant with those implied by the cvar
array. Solvers, such as PATH, that just used the variable bounds
are unaffected by this bug fix.
Fri Oct 6 10:21:04 EDT 2000
pfg_read.c, pfghread.c: cope with 0*variable, which prior to AMPL
version 20001006 could arise from expressions of the form
v1*sum{i in A} p[i]*v[i], where v and v1 are variables and p[i] == 0
for all i.
Mon Oct 9 17:03:24 EDT 2000
funcadd1.c: fix a possible fault with use of imported functions.
The fault, if it occurred, happened at the end of execution (except
under -DCLOSE_AT_RESET, when it happened when ASF_free was called).
Wed Nov 1 17:27:49 EST 2000
mach.c: tweak to prevent trouble with optimization by a very recent
version of gcc.
dtoa.c: "invisible" tweaks (to be detailed in a forthcoming update
to /netlib/fp/changes).
Fri Nov 3 09:28:10 EST 2000
funcadd.h: correct comment describing FUNCADD_012ARGS, which is for
*random* real valued functions; asldate.c not changed.
dtoa.c: sync with /netlib/fp/dtoa.c
Fri Nov 10 17:43:07 EST 2000
pfg_read.c, pfghread.c: fix glitch with constant-valued defined
variables (which can arise with "option presolve 0" -- a bad
idea in general): they were evaluated at twice their correct value.
All nonlinear .nl readers: in calls on imported functions with
expressions involving variables in the argument list (so al->derivs
and, if relevant, al->hes will be nonzero), initialize all components
of al->derivs and al->hes to zero. Previously, only the al->hes
components were so initialized.
Mon Nov 13 22:54:19 EST 2000
pfg_read.c, pfghread.c: fix a performance bug with defined variables
that sometimes resulted in explicit constant zeros in sparse Hessians.
The bug bit when, say, the objective made linear reference to a defined
variable that itself was the (possibly weighted) sum of defined
variables. Example:
param N default 3; set I := 1..N;
set T default 1..2; set P := {i in I, j in i+1..N};
var d{P,T} >= 0.01 := 1;
var p{(i,j) in P, k in T} = (i+j)/d[i,j,k];
var r{k in T} = 12*sum{(i,j) in P} p[i,j,k];
var t = sum{k in T} 2*r[k];
minimize zap: .05*t;
The computed Hessian had explicit zeros in the (i,j) positions for
all i < j.
Wed Nov 15 17:40:13 EST 2000
nqpcheck.c: fix bug in handling defined variables that are the sum of
two or more quadratic terms. Example where the bug bit:
set I := 1..2; var x{i in I} := i;
var y = 7*sum{i in I} (x[i]/(i+1))^2;
minimize zot: 10*y;
On this example, ampl/solvers/examples/qtest reported objective value
17.5 rather than 48.6111111111111.
misc.c: correct names in some error messages for incorrect usage
(calls out of sequence).
Fri Nov 17 16:57:18 EST 2000
fg_read.c: fix a bug that could only manifest itself under unusual
circumstances: calling fg_read() after assigning want_derivs = 0, with
top-level "if" or "min" or "max" expressions, as in "nlc -1 foo", where
foo.nl comes from
var x {1..3}; s.t. c: min (x[1],x[2],x[3]) = 5;
misc.c: banish register declarations ("invisible" tweak).
Thu Dec 28 18:44:14 EST 2000
pfg_read.c, pfghread.c: fix a bug in handling chains of defined
variables of the form v[i+1] = v[i]. The smallest known example
where the bug bit is the rather baroque
var v0 >= 0 := .02;
var v1 >= 0 := 13.23;
var v2 := -1.288;
var v3 := -1.288;
var v4 >= 0 := 13.23;
var v5 = .5*v0*(v2 - 1.288);
var v6 = v5 + .5*v0*(v2 + v3);
var v7 = v6 + .5*v0*(v3 - 1.288);
var v8 = v7;
var v9 = v8;
var v10 = v9;
minimize zot: v4;
s.t. c0: 60.536*v0 - v10 = 100;
s.t. c1: -.5*v0*(v1 + 13.23) = -.2646;
When it bit, the bug caused incorrect Jacobian evaluations.
Tue Jan 2 18:51:43 EST 2001
asl.h: tweak to permit making Win32 DLLs that access stdio by
starting with
#define NO_STDIO1
#define Permit_AE_redefs
#include "asl.h"
and arranging separately to make "ae" visible; asldate.c not changed.
Mon Jan 15 17:09:34 EST 2001
conpval.c, pfg_read.c, pfghread.c: fix Hessian bug in handling
unary(unary(terms(x))
where terms(x) is the sum of two or more terms involving different
subsets of the variables x. Example:
var x{1..2} := .5; minimize zot: sin(-(x[1] + x[2]));
Note the -(), i.e., negation, is a unary function.
Tue Jan 16 13:30:39 EST 2001
rops.c, rops2.c: reorder partial derivative computations for
x^y and x^c (constant power) to avoid trouble when x^y or x^c
underflows to zero.
Wed Feb 7 13:15:13 EST 2001
dtoa.c, dtoa1.c, atof.c: obscure bug fixes (see /netlib/fp/changes).
Thu Mar 22 14:07:07 EST 2001
funcadd.h: fix a typo in a comment (s/funcadd/addfunc/).
misc.c: tweak to permit reading ASCII .nl files massaged to have
either Microsoft (\r\n) or Macintosh (\r) end-of-line notation.
Fri Apr 27 18:01:04 EDT 2001
suf_sos.c: fix a glitch that will matter to MIP solvers that handle
SOS2 sets once AMPL's forthcoming "variable in union of intervals"
extension is available. A fault was possible.
Wed May 9 23:36:02 EDT 2001
printf.c: Have printf("%s",0) print "<NULL>" rather than fault.
This affects both solvers and imported (user-defined) functions.
funcadd.h: add some #ifdef _WIN32 goo for added flexibility.
Thu May 10 17:34:16 EDT 2001
qp_read.c: fix a bug in qp_opify that would cause a fault when it bit.