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/*
ARPACK++ v1.2 2/20/2000
c++ interface to ARPACK code.
MODULE DNMatrxW.h
Class template for the n by n matrix A with entries
A(i,j) = k*(s(i))*(t(j)-1), if i <= j,
k*(t(j))*(s(i)-1), if j < i.
where s(i) = i/(n+1), t(j) = j/(n+1) and k = 1/(n+1).
ARPACK Authors
Richard Lehoucq
Danny Sorensen
Chao Yang
Dept. of Computational & Applied Mathematics
Rice University
Houston, Texas
*/
#ifndef DNMATRXW_H
#define DNMATRXW_H
template<class ARFLOAT>
void MatrixW(int m, int n, ARFLOAT* &A)
{
int i, j, p;
ARFLOAT h, k;
// Defining h.
h = 1.0/ARFLOAT(m+1);
k = 1.0/ARFLOAT(n+1);
// Creating output vector A.
A = new ARFLOAT[m*n];
p = 0;
for (j=1; j<=n; j++) {
for (i=1; i<=j; i++) {
A[p++] = k*(ARFLOAT(j)*k-1.0)*(ARFLOAT(i)*h);
}
for(i=j+1; i<=m; i++) {
A[p++] = k*(ARFLOAT(i)*h-1.0)*(ARFLOAT(j)*k);
}
}
} // MatrixW.
#endif // DNMATRXW_H
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