Original Version

1 files changed, 41 insertions, 0 deletions

diff --git a/src/c/statisticsFunctions/stdevf/cstdevfcs.c b/src/c/statisticsFunctions/stdevf/cstdevfcs.c
new file mode 100644
index 00000000..a3b7239f
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+++ b/src/c/statisticsFunctions/stdevf/cstdevfcs.c
@@ -0,0 +1,41 @@
+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2008-2008 - INRIA - Allan SIMON
+ *
+ *  This file must be used under the terms of the CeCILL.
+ *  This source file is licensed as described in the file COPYING, which
+ *  you should have received as part of this distribution.  The terms
+ *  are also available at
+ *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ *
+ */
+
+#include "stdevf.h" 
+
+floatComplex cstdevfcs(floatComplex *in1, int lines, int columns, float* in2)
+{
+  int i = 0 ;
+  floatComplex temp = FloatComplex(0.0f,0.0f);
+  floatComplex accumulate = FloatComplex(0.0f,0.0f);
+  float accumulateFre = 0.0f ;
+  floatComplex meanf = cmeanfcs (in1 , lines ,columns , in2);
+/*equivalent to  (in1 - meanf(x , in2 )).^2 .*in2   */
+  for(i = 0 ; i < lines*columns ; ++i)
+    {
+     temp = cpows (  cdiffs (in1[i] , meanf ) ,FloatComplex (2.0f, 0.0f ) );
+     temp = cmuls( FloatComplex (in2[i],0.0f) , temp);
+
+     accumulate = cadds( temp , accumulate);
+     accumulateFre +=  in2[i];
+    }
+
+    if (lines <= 1)
+      {
+        return cmuls (FloatComplex(0.0f,0.0f) , accumulate ) ; 
+      }
+    else
+      {
+        accumulate = FloatComplex(  creals(accumulate ) / (accumulateFre - 1) , cimags(accumulate)  / (accumulateFre - 1));
+        return csqrts(accumulate);
+      }
+}