Fix for better comparison to zero with extremely small values (<0.000…

…00001)
trufanov-nok · Sep 14, 2009 · 8664a2b · 8664a2b
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diff --git a/ta-lib/CHANGELOG.TXT b/ta-lib/CHANGELOG.TXT
@@ -6,6 +6,8 @@ New Features
 - VS2005 makefile for SWIG Python interface.
 - MacOS makefile for SWIG Perl interface.
 - Visual Studio 2008 support
+- General fix to floating point processing for support 
+  of calculation with very small values (<0.00000001).
 
 Fixes
 =====

diff --git a/ta-lib/c/src/ta_func/ta_utility.h b/ta-lib/c/src/ta_func/ta_utility.h
@@ -254,9 +254,10 @@ void TA_S_INT_stddev_using_precalc_ma( const float  *inReal,
  * must be carefully choosen to work in the domain of the tested values.  
  * Do a search on Google for a more generalize algo.
  */
+#define TA_EPSILON (0.00000000000001)
 #define TA_REAL_EQ(x,v,ep)   (((v-ep)<x)&&(x<(v+ep)))
-#define TA_IS_ZERO(v)        (((-0.00000001)<v)&&(v<0.00000001))
-#define TA_IS_ZERO_OR_NEG(v) (v<0.00000001)
+#define TA_IS_ZERO(v)        (((-TA_EPSILON)<v)&&(v<TA_EPSILON))
+#define TA_IS_ZERO_OR_NEG(v) (v<TA_EPSILON)
 
 /* The following macros are being used to do
  * the Hilbert Transform logic as documented