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/*
ARPACK++ v1.0 8/1/1997
c++ interface to ARPACK code.
MODULE DCMatrxC.h
Function template for the mass matrix formed by using piecewise
linear elements on [0, 1].
ARPACK Authors
Richard Lehoucq
Danny Sorensen
Chao Yang
Dept. of Computational & Applied Mathematics
Rice University
Houston, Texas
*/
#ifndef DCMATRXC_H
#define DCMATRXC_H
#include "arcomp.h"
template<class FLOAT, class INT>
void CompMatrixC(INT n, arcomplex<FLOAT>* &A)
{
INT i, j;
arcomplex<FLOAT> diag, sub;
// Defining constants.
sub = arcomplex<FLOAT>(1.0/(FLOAT)(n+1), 0.0);
diag = arcomplex<FLOAT>(4.0/(FLOAT)(n+1), 0.0);
// Creating output vector A.
A = new arcomplex<FLOAT>[n*n];
for (i=0; i<n*n; i++) A[i] = arcomplex<FLOAT>(0.0, 0.0);
for (i=0, j=0; i<n; i++, j+=n+1) {
if (i) A[j-1] = sub;
A[j] = diag;
if (n-i-1) A[j+1] = sub;
}
} // CompMatrixC.
#endif // DCMATRXC_H
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