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/determ/sdeterma.c | 97 ++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/c/matrixOperations/determ/sdeterma.c

(limited to 'src/c/matrixOperations/determ/sdeterma.c')

diff --git a/src/c/matrixOperations/determ/sdeterma.c b/src/c/matrixOperations/determ/sdeterma.c
new file mode 100644
index 0000000..dbe36c9
--- /dev/null
+++ b/src/c/matrixOperations/determ/sdeterma.c
@@ -0,0 +1,97 @@
+/*
+ *  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"
+#endif
+#include "determ.h"
+
+float sdeterma(float * in, int size){
+#ifndef WITHOUT_LAPACK
+	float out;
+	double *inCopy;
+	int* tmp;
+	int info=0,i=0;
+	
+
+	
+	/*Calculation of the determinant*/	
+	
+	switch (size){
+		case 2 : out = in[0]*in[3]-in[1]*in[2];
+			 break;
+		case 3 : /*regle de Sarrus*/
+			 out = in[0]*in[4]*in[8]+in[1]*in[5]*in[6]+in[2]*in[3]*in[7]
+			      -in[0]*in[5]*in[7]-in[1]*in[3]*in[8]-in[2]*in[4]*in[6];
+			 break;
+		default : 
+		
+			  /*Copy the input matrix*/
+			  inCopy=(double*)malloc((unsigned int)(size*size)*sizeof(double));
+			  tmp=(int*)malloc((unsigned int)size*sizeof(int));
+			  for (i=0;i<size*size;i++) inCopy[i]=(double)in[i];
+			  
+			  dgetrf_(&size, &size, inCopy, &size, tmp, &info);
+			  out=1;
+			  for (i=0;i<size;i++){
+			  	if (tmp[i]!=i+1) out=-out;
+			  	out=(float)inCopy[i*(size+1)]*out;
+			  }
+			  free(tmp);
+			  free(inCopy);
+			  break;
+	}
+#else
+	int i=0, j=0, k=0;
+	float out=0, pivot=0;
+	float *inCopy=NULL;
+	
+	/*Calculation of the determinant*/
+	switch (size){
+		case 2 : out = in[0]*in[3]-in[1]*in[2];
+			 break;
+		case 3 : /*regle de Sarrus*/
+			 out = in[0]*in[4]*in[8]+in[1]*in[5]*in[6]+in[2]*in[3]*in[7]
+			      -in[0]*in[5]*in[7]-in[1]*in[3]*in[8]-in[2]*in[4]*in[6];
+			 break;
+		default : 
+				
+				  /*Copy the input matrix*/
+			  inCopy=malloc((unsigned int)(size*size)*sizeof(float));
+			  for (i=0;i<size*size;i++) inCopy[i]=in[i];
+			  
+    			  for (i=0;i<size;i++){
+				for (j=i+1;j<size;j++){
+					pivot = inCopy[i*size+j]/inCopy[i*size+i];
+					for (k=0;k<size-i;k++){
+						inCopy[i*size+j+k*size]-=pivot*inCopy[i*size+i+k*size];
+					}
+				}
+			  }
+			  out=1;
+			  for (i=0;i<size;i++){
+			  	out *= inCopy[i*size+i];
+			  }
+			  free(inCopy);
+			  break;
+		
+	}
+
+
+#endif
+	
+	return out;
+}
+
+
+
-- 
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