Mac binaries

[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_c / routines / solvele.c

diff --git a/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_c/routines/solvele.c b/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_c/routines/solvele.c
new file mode 100644 (file)
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--- /dev/null
+++ b/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_c/routines/solvele.c
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+/*
+ *   This file is part of TISEAN
+ *
+ *   Copyright (c) 1998-2007 Rainer Hegger, Holger Kantz, Thomas Schreiber
+ *
+ *   TISEAN is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   TISEAN is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with TISEAN; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+/* Author: Rainer Hegger Last modified: Aug 14th, 1998 */
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "tisean_cec.h"
+
+void solvele(double **mat,double *vec,unsigned int n)
+{
+  double vswap,*mswap,*hvec,max,h,pivot,q;
+  int i,j,k,maxi;
+
+  for (i=0;i<n-1;i++) {
+    max=fabs(mat[i][i]);
+    maxi=i;
+    for (j=i+1;j<n;j++)
+      if ((h=fabs(mat[j][i])) > max) {
+       max=h;
+       maxi=j;
+      }
+    if (maxi != i) {
+      mswap=mat[i];
+      mat[i]=mat[maxi];
+      mat[maxi]=mswap;
+      vswap=vec[i];
+      vec[i]=vec[maxi];
+      vec[maxi]=vswap;
+    }
+    
+    hvec=mat[i];
+    pivot=hvec[i];
+    if (fabs(pivot) == 0.0) {
+      fprintf(stderr,"Singular matrix! Exiting!\n");
+      exit(SOLVELE_SINGULAR_MATRIX);
+    }
+    for (j=i+1;j<n;j++) {
+      q= -mat[j][i]/pivot;
+      mat[j][i]=0.0;
+      for (k=i+1;k<n;k++)
+       mat[j][k] += q*hvec[k];
+      vec[j] += q*vec[i];
+    }
+  }
+  vec[n-1] /= mat[n-1][n-1];
+  for (i=n-2;i>=0;i--) {
+    hvec=mat[i];
+    for (j=n-1;j>i;j--)
+      vec[i] -= hvec[j]*vec[j];
+    vec[i] /= hvec[i];
+  }
+}