/* nag_sparse_herm_matvec (f11xsc) Example Program.
*
* Copyright 2014 Numerical Algorithms Group.
*
* Mark 23, 2011.
*/

#include <nag.h>
#include <nag_stdlib.h>
#include <nagf11.h>

int main(void)
{
/* Scalars */
Integer                 exit_status = 0;
Integer                 i, j, n, nnz;
/* Arrays */
char                    nag_enum_arg[40];
Integer                 *irow = 0, *icol = 0;
Complex                 *a = 0, *x = 0, *y = 0;
/* NAG types */
NagError                fail;
Nag_SparseSym_CheckData check;

INIT_FAIL(fail);

printf("nag_sparse_herm_matvec (f11xsc) Example Program Results\n");

/* Skip heading in data file */
scanf("%*[^\n]");

/* Read order of matrix and number of non-zero entries */
scanf("%ld%*[^\n]", &n);
scanf("%ld%*[^\n]", &nnz);

/* Allocate memory */
if ( !(a = NAG_ALLOC(nnz, Complex)) ||
!(x = NAG_ALLOC(n, Complex)) ||
!(y = NAG_ALLOC(n, Complex)) ||
!(icol = NAG_ALLOC(nnz, Integer)) ||
!(irow = NAG_ALLOC(nnz, Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Read the matrix A */
for (i = 0; i < nnz; i++)
scanf(" ( %lf , %lf ) %ld%ld%*[^\n]", &a[i].re, &a[i].im,
&irow[i], &icol[i] );

/* Read the vector x */
for (j = 0; j < n; j++) scanf(" ( %lf , %lf ) ", &x[j].re, &x[j].im);
scanf("%*[^\n]");

/* Calculate matrix-vector product */
/* Nag_SparseSym_Check */
scanf("%39s%*[^\n]", nag_enum_arg);
check = (Nag_SparseSym_CheckData) nag_enum_name_to_value (nag_enum_arg);

/* nag_sparse_herm_matvec (f11xsc)
* Complex sparse Hermitian matrix vector multiply.
*/
nag_sparse_herm_matvec(n, nnz, a, irow, icol, check, x, y, &fail);
if (fail.code != NE_NOERROR)
{
printf("Error from nag_sparse_herm_matvec (f11xsc)\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Output results */
printf(" Matrix-vector product\n");
for (j = 0; j < n; j++)
printf(" (%13.4e, %13.4e)\n", y[j].re, y[j].im);

END:
NAG_FREE(a);
NAG_FREE(x);
NAG_FREE(y);
NAG_FREE(icol);
NAG_FREE(irow);

return exit_status;
}