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/*
ARPACK++ v1.2 2/20/2000
c++ interface to ARPACK code.
MODULE LCMatrxF.h
Function template for a tridiagonal complex matrix.
ARPACK Authors
Richard Lehoucq
Danny Sorensen
Chao Yang
Dept. of Computational & Applied Mathematics
Rice University
Houston, Texas
*/
#ifndef LCMATRXF_H
#define LCMATRXF_H
#include "arcomp.h"
template<class ARFLOAT, class ARINT>
void CompMatrixF(ARINT n, ARINT& nnz, arcomplex<ARFLOAT>* &A,
ARINT* &irow, ARINT* &pcol)
{
ARINT i, j;
arcomplex<ARFLOAT> h, dd, ds;
// Defining constants.
const arcomplex<ARFLOAT> one(1.0, 0.0);
const arcomplex<ARFLOAT> four(4.0, 0.0);
h = one/arcomplex<ARFLOAT>((ARFLOAT)(n+1),0.0);
dd = four*h;
ds = one*h;
// Defining the number of nonzero matrix elements.
nnz = 3*n-2;
// Creating output vectors.
A = new arcomplex<ARFLOAT>[nnz];
irow = new ARINT[nnz];
pcol = new ARINT[n+1];
// Filling A, irow and pcol.
pcol[0] = 0;
j = 0;
for (i=0; i!=n; i++) {
if (i) {
irow[j] = i-1;
A[j++] = ds;
}
irow[j] = i;
A[j++] = dd;
if (i!=(n-1)) {
irow[j] = i+1;
A[j++] = ds;
}
pcol[i+1] = j;
}
} // CompMatrixF.
#endif // LCMATRXF_H
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