Revision 0dbb71197f123f711e714db6f8f55b40031f4529 authored by A.I. McLeod on 14 December 2012, 00:00:00 UTC, committed by Gabor Csardi on 14 December 2012, 00:00:00 UTC
1 parent b417f2d
upperWedge.c
// Converts a doubly symmetric matrix to a list of vectors for more compact storage
#include "trenchR.h"
void upperWedge(double *phi,double sigsq,int n,double **b)
{
int i,j,n1;
VECTOR v = Vector(n);
for (i = 1; i <= n-1; i++)
v[i-1] = -phi[n-i-1] / sigsq;
b[0][0] = 1.0 / sigsq;
for (j = 2; j <= n; j++)
b[0][j-1] = v[n-j];
n1 = (int)((n-1)/2);
for (i = 2; i <= n1+1; i++)
for (j = i; j <= n-i+1; j++)
b[i-1][j-1] = b[i-2][j-2] + (v[n-j] * v[n-i]
-v[i-2] * v[j-2]) * sigsq;
free_vector(v);
return;
}
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