1 files changed, 80 insertions, 0 deletions
diff --git a/2.3-1/src/c/matrixOperations/chol/zchola.c b/2.3-1/src/c/matrixOperations/chol/zchola.c
new file mode 100644
index 00000000..730c2415
--- /dev/null
+++ b/2.3-1/src/c/matrixOperations/chol/zchola.c
@@ -0,0 +1,80 @@
+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2008 - INRIA - Arnaud TORSET
+ *
+ *  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 <stdlib.h>
+#ifndef WITHOUT_LAPACK
+#include "lapack.h"
+#else
+#include "multiplication.h"
+#include "division.h"
+#include "subtraction.h"
+#include "sqrt.h"
+#endif
+
+#include "chol.h"
+
+void zchola(doubleComplex * in, int size, doubleComplex *out){
+	/* param in : input matrix (square matrix)
+	   param size : number of rows or columns
+	   param out : output upper triangular matrix
+	*/
+	
+#ifndef WITHOUT_LAPACK	
+	int i=0, j=0, info=0;
+	
+	for(i=0;i<size*size;i++)	out[i]=in[i];
+
+	C2F(zpotrf)("U", &size, out, &size, &info);
+	
+	/*Zeros in the lower triangular part*/
+	for (i=0;i<size;i++){
+		for (j=i+1;j<size;j++){
+			out[j+i*size]=DoubleComplex(0,0);
+		}
+	}
+
+#else
+	/* Do not use Lapack functions*/
+
+	int i=0, j=0, k=0;
+	doubleComplex tmp,transposee;
+	double accu;
+	
+	for (i=0;i<size;i++){
+		accu=0.0f;
+		for (j=0;j<i;j++){
+			tmp=in[i*size+j];
+			for (k=0;k<j;k++){
+				transposee=DoubleComplex(zreals(out[j*size+k]),-zimags(out[j*size+k]));
+				tmp = zdiffs(tmp,zmuls(out[i*size+k],transposee));
+			}
+			out[i*size+j]= zrdivs(tmp,out[j*size+j]);
+			accu += zreals(out[i*size+j])*zreals(out[i*size+j]);
+			accu += zimags(out[i*size+j])*zimags(out[i*size+j]);
+		}
+		tmp = DoubleComplex(zreals(in[i*size+i])-accu,0);
+		out[i*size+i]=zsqrts(tmp);	
+	}
+	
+	/*Zeros in the lower triangular part*/
+	for (i=0;i<size;i++){
+		for (j=i+1;j<size;j++){
+			out[j+i*size]=DoubleComplex(0,0);
+		}
+	}
+
+
+	
+#endif		
+}
+
+