1 files changed, 36 insertions, 0 deletions
diff --git a/src/c/linearAlgebra/spec2/cspec2a.c b/src/c/linearAlgebra/spec2/cspec2a.c
new file mode 100644
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--- /dev/null
+++ b/src/c/linearAlgebra/spec2/cspec2a.c
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+/*
+ *  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 "spec.h"
+
+
+
+void cspec2a(floatComplex* in, int rows, floatComplex* eigenvalues,floatComplex* eigenvectors){
+	/* As we use Lapack to find the eigenvalues, we must cast the floatComplex input into doubleComplex
+	and the doubleComplex outputs of dspeca into floatComplex*/
+	
+	int i;
+	doubleComplex* dblin;
+	doubleComplex* dbleigenvalues,*dbleigenvectors;
+	
+	dblin=(doubleComplex*)malloc((unsigned int)(rows*rows)*sizeof(doubleComplex));
+	dbleigenvalues=(doubleComplex*)malloc((unsigned int)(rows*rows)*sizeof(doubleComplex));	
+	dbleigenvectors=(doubleComplex*)malloc((unsigned int)(rows*rows)*sizeof(doubleComplex));
+	
+	for (i=0;i<rows*rows;i++) dblin[i]=DoubleComplex((double)creals(in[i]),(double)cimags(in[i]));
+	
+	zspec2a(dblin,rows,dbleigenvalues,dbleigenvectors);
+	
+	for (i=0;i<rows*rows;i++) eigenvalues[i]=FloatComplex((float)zreals(dbleigenvalues[i]),(float)zimags(dbleigenvalues[i]));
+	for (i=0;i<rows*rows;i++) eigenvectors[i]=FloatComplex((float)zreals(dbleigenvectors[i]),(float)zimags(dbleigenvectors[i]));
+}