From 362bd2337910fec57d854ebb179772efe552f929 Mon Sep 17 00:00:00 2001
From: Sandeep Gupta
Date: Mon, 19 Jun 2017 17:02:45 +0530
Subject: 19-June-2017
---
src/c/linearAlgebra/spec/zspeca.c | 80 +++++++++++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)
create mode 100644 src/c/linearAlgebra/spec/zspeca.c
(limited to 'src/c/linearAlgebra/spec/zspeca.c')
diff --git a/src/c/linearAlgebra/spec/zspeca.c b/src/c/linearAlgebra/spec/zspeca.c
new file mode 100644
index 00000000..a2b1c25a
--- /dev/null
+++ b/src/c/linearAlgebra/spec/zspeca.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>
+#include "spec.h"
+#include "lapack.h"
+#include "zeros.h"
+#include "conj.h"
+
+void zspeca(doubleComplex* in, int rows,doubleComplex* out){
+ int i = 0, j = 0;
+ int hermitian = 0;
+ int INFO = 0;
+ int iWorkSize = 0;
+ doubleComplex* pdblWork;
+ doubleComplex* pdblLeftvectors;
+ doubleComplex* pdblRightvectors;
+ doubleComplex* pdblRWork;
+ double* outReal;
+ double* outImag;
+ doubleComplex* inCopy;
+
+ inCopy = (doubleComplex*)malloc((unsigned int)(rows*rows) * sizeof(doubleComplex));
+ outReal = (double*)malloc((unsigned int)rows * sizeof(double));
+ outImag = (double*)malloc((unsigned int)rows * sizeof(double));
+ pdblLeftvectors=NULL;
+ pdblRightvectors=NULL;
+
+ iWorkSize = 2*rows;
+ pdblWork = (doubleComplex*)malloc((unsigned int)iWorkSize * sizeof(doubleComplex));
+ pdblRWork = (doubleComplex*)malloc((unsigned int)(3*rows) * sizeof(doubleComplex));
+
+ for(i=0;i<rows*rows;i++) inCopy[i]=DoubleComplex(zreals(in[i]),zimags(in[i]));
+
+ /* look if the matrix is symmetric */
+ for (i=0;i<rows;i++){
+ for (j=0;j<rows;j++)
+ if ( (zreals(in[i*rows+j])!=zreals(zconjs(in[i+j*rows]))) ||
+ (zimags(in[i*rows+j])!=zimags(zconjs(in[i+j*rows]))) )
+ break;
+ if (j!=rows) break;
+ }
+
+
+ /* the matrix is symmetric if the 2 loops goes to end i.e
+ i==rows and j==rows */
+ if ((i==rows)&&(j==rows)) hermitian=1;
+
+
+ /* apply lapack function according to symmetry */
+ if(hermitian){
+ C2F(zheev)( "N", "U", &rows, inCopy, &rows, outReal, pdblWork, &iWorkSize, outImag, &INFO );
+ dzerosa(outImag,1,rows);
+ for (i=0;i<rows;i++) out[i]=DoubleComplex(outReal[i],outImag[i]);
+ }
+ else {
+ C2F(zgeev)( "N", "N", &rows, inCopy, &rows, out,
+ pdblLeftvectors, &rows, pdblRightvectors, &rows, pdblWork, &iWorkSize,
+ pdblRWork, &INFO );
+ }
+
+
+
+ free(inCopy);
+ free(outReal);
+ free(outImag);
+ free(pdblWork);
+ free(pdblRWork);
+ free(pdblLeftvectors);
+ free(pdblRightvectors);
+}
--
cgit