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/*
ARPACK++ v1.2 2/20/2000
c++ interface to ARPACK code.
MODULE BNMatrxE.h
Function template for the tridiagonal matrix with 4 on the main
diagonal and 1 on the subdiagonal and superdiagonal.
ARPACK Authors
Richard Lehoucq
Danny Sorensen
Chao Yang
Dept. of Computational & Applied Mathematics
Rice University
Houston, Texas
*/
#ifndef BNMATRXE_H
#define BNMATRXE_H
template<class ARFLOAT, class ARINT>
void BandMatrixE(ARINT n, ARINT& nL, ARINT& nU, ARFLOAT* &A)
{
ARINT j;
// Defining the upper and lower bandwidth.
nL = 1;
nU = 1;
// Creating output vector A.
A = new ARFLOAT[3*n];
for (j=1; j<(3*n); j+=3) {
if (j-1) A[j-1] = 1.0;
A[j] = 4.0;
if (n-j-1) A[j+1] = 1.0;
}
} // BandMatrixE.
#endif // BNMATRXE_H
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