Basic example from pyminuit homepage gives incorrect results

[GoogleCodeExporter]

I have attached the script test_minuit.py and the output test_minuit_output.txt 
I get that shows the incorrect results.

What version of the product are you using? On what operating system?
pyminuit 1.2.0 linked against SEAL-Minuit 1.7.9 with python 2.7 on Mac OS X 10.7

Would it be possible to extend test_minuit.py to also run and check hesse and 
minos?
And to make that easily accessible as minuit.test()?

Original issue reported on code.google.com by Deil.Chr...@googlemail.com on 29 Aug 2011 at 11:07

Attachments:

• test_minuit.py
• test_minuit_output.txt

[GoogleCodeExporter]

Hi,

Sorry, I don't see anything wrong with these results.  To check them, I plotted 
the function f (defined in test_minuit.py) at the minimum, plus-or-minus one 
sigma:

>>> from cassius import *     # http://code.google.com/p/cassius/
>>> view(Curve(lambda x: f(x, 0.00085), xmin=2.00-3.00, xmax=2.00+3.00))
>>> view(Curve(lambda y: f(2.00, y), xmin=0.00085-1., xmax=0.00085+1.))

In both direction, the minimum is at the center of the plot and the function 
increases by about one unit at the edges.  The non-parabolic shape of the y 
curve is the reason for the difference between MIGRAD/HESSE and MINOS.

-- JIm

Original comment by jpivar...@gmail.com on 30 Aug 2011 at 3:34

[GoogleCodeExporter]

Sorry Jim, you are right.
There is nothing wrong with the results, I confused this with another problem I 
had.
Please close this ticket.
-- Christoph

Original comment by Deil.Chr...@googlemail.com on 31 Aug 2011 at 3:12

[GoogleCodeExporter]

Original comment by jpivar...@gmail.com on 31 Aug 2011 at 3:30

• Changed state: Invalid