SoftThresholding/C++ function: added handling of empty array as threshold (for crappy/faulty usage)

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

git-svn-id: https://svn.code.sf.net/p/dct/code/trunk@676 4c865b51-4357-4376-afb4-474e03ccb993

zUtil_Cxx/CompressiveSensing/gtSoftThreshold.cpp

@@ -32,10 +32,11 @@ void mexFunction( int nlhs, mxArray * plhs[], int nrhs, const mxArray * prhs[] )
     }
   }
 
-  const double * const __restrict inData = mxGetPr(prhs[0]);
-  double * const __restrict outData = mxGetPr(prhs[1]);
-
-  soft_threshold<mwSize, double> thr(*mxGetPr(prhs[1]));
+  double threshold = 0;
+  if (mxGetNumberOfElements(prhs[1]) != 0) {
+    threshold = *mxGetPr(prhs[1]);
+  }
+  soft_threshold<mwSize, double> thr(threshold);
 
   const mwSize numElems = mxGetNumberOfElements(prhs[0]);
   if (copy) {