Add spec, which computes the eigenvalues of the matrix

1 files changed, 34 insertions, 0 deletions

diff --git a/src/matrixOperations/spec/cspeca.c b/src/matrixOperations/spec/cspeca.c
new file mode 100644
index 00000000..b14fddd3
--- /dev/null
+++ b/src/matrixOperations/spec/cspeca.c
@@ -0,0 +1,34 @@
+/*
+ *  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 "spec.h"
+
+
+
+void cspeca(floatComplex* in, int rows, floatComplex* out){
+	/* As we use Lapack to find the eigenvalues, we must cast the floatComplex input into doubleComplex
+	and the doubleComplex output of dspeca into floatComplex*/
+	
+	int i;
+	doubleComplex* dblin;
+	doubleComplex* dblout;
+	
+	dblin=malloc((uint)(rows*rows)*sizeof(doubleComplex));
+	dblout=malloc((uint)rows*sizeof(doubleComplex));
+	
+	for (i=0;i<rows*rows;i++) dblin[i]=DoubleComplex((double)creals(in[i]),(double)cimags(in[i]));
+	
+	zspeca(dblin,rows,dblout);
+	
+	for (i=0;i<rows;i++) out[i]=FloatComplex((float)zreals(dblout[i]),(float)zimags(dblout[i]));
+}