From 277d1edfa17bf3719d90ddbac8e31f6181e952c3 Mon Sep 17 00:00:00 2001
From: Sandeep Gupta
Date: Sun, 18 Jun 2017 23:55:40 +0530
Subject: First commit

---
 src/c/matrixOperations/dist/ddista.c | 53 ++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/c/matrixOperations/dist/ddista.c

(limited to 'src/c/matrixOperations/dist/ddista.c')

diff --git a/src/c/matrixOperations/dist/ddista.c b/src/c/matrixOperations/dist/ddista.c
new file mode 100644
index 0000000..bf051a6
--- /dev/null
+++ b/src/c/matrixOperations/dist/ddista.c
@@ -0,0 +1,53 @@
+/*
+ *  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>
+#include "dist.h"
+#include "matrixTranspose.h"
+#include "matrixMultiplication.h"
+#include "spec.h"
+#include "sqrt.h"
+
+
+double ddista(double* in1,double* in2, int lines, int columns){
+	int i=0;
+	double out=0;
+	double *a, *at, *mul;
+	doubleComplex *eigenvalues,*mulCpx;
+	
+	
+	/* FIXME : malloc here*/
+	a=(double*)malloc((unsigned int)(lines*columns)*sizeof(double));
+	at=(double*)malloc((unsigned int)(lines*columns)*sizeof(double));
+	mul=(double*)malloc((unsigned int)(lines*lines)*sizeof(double));
+	eigenvalues=(doubleComplex*)malloc((unsigned int)(lines)*sizeof(doubleComplex));
+	mulCpx=(doubleComplex*)malloc((unsigned int)(lines*lines)*sizeof(doubleComplex));
+		
+	for (i=0;i<lines*columns;i++) a[i]=in1[i]-in2[i];
+	dtransposea(a,lines, columns,at);
+	dmulma(a,lines,columns,at,columns,lines,mul);
+	for (i=0;i<lines*lines;i++) mulCpx[i]=DoubleComplex(mul[i],0);
+	zspeca(mulCpx,lines,eigenvalues);
+	zsqrta(eigenvalues,lines,eigenvalues);
+	
+	/* Research of the higher value of eigenvalues*/
+	for (i=0;i<lines;i++){
+		if (zreals(eigenvalues[i])>out) out = zreals(eigenvalues[i]);
+	}
+	
+	free(a);
+	free(at);
+	free(mul);
+	free(eigenvalues);
+	free(mulCpx);
+	
+	return out;
+}
-- 
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