/* nag_zggsvp (f08vsc) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.1, 2017.
*/

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagf08.h>
#include <nagf16.h>
#include <nagx02.h>

int main(void)
{
/* Scalars */
double norm, eps, tola, tolb;
Integer i, irank, j, k, l, m, n, nrows, p, pda, pdb, pdq, pdu, pdv;
Integer exit_status = 0;

/* Arrays */
Complex *a = 0, *b = 0, *q = 0, *u = 0, *v = 0;

/* Nag Types */
NagError fail;
Nag_OrderType order;

#ifdef NAG_COLUMN_MAJOR
#define A(I, J) a[(J-1)*pda + I - 1]
#define B(I, J) b[(J-1)*pdb + I - 1]
order = Nag_ColMajor;
#else
#define A(I, J) a[(I-1)*pda + J - 1]
#define B(I, J) b[(I-1)*pdb + J - 1]
order = Nag_RowMajor;
#endif

INIT_FAIL(fail);

printf("nag_zggsvp (f08vsc) Example Program Results\n\n");

/* Skip heading in data file */
scanf("%*[^\n]");
scanf("%" NAG_IFMT "%" NAG_IFMT "%" NAG_IFMT "%*[^\n]", &m, &n, &p);
if (n < 0 || m < 0 || p < 0) {
printf("Invalid n, m or p\n");
exit_status = 1;
goto END;
}

#ifdef NAG_COLUMN_MAJOR
pda = m;
pdb = p;
pdv = p;
#else
pda = n;
pdb = n;
pdv = m;
#endif
pdq = n;
pdu = m;

/* Allocate memory */
if (!(a = NAG_ALLOC(m * n, Complex)) ||
!(b = NAG_ALLOC(p * n, Complex)) ||
!(q = NAG_ALLOC(n * n, Complex)) ||
!(u = NAG_ALLOC(m * m, Complex)) || !(v = NAG_ALLOC(p * m, Complex)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Read the m by n matrix A and p by n matrix B from data file */
for (i = 1; i <= m; ++i)
for (j = 1; j <= n; ++j)
scanf(" ( %lf , %lf )", &A(i, j).re, &A(i, j).im);
scanf("%*[^\n]");
for (i = 1; i <= p; ++i)
for (j = 1; j <= n; ++j)
scanf(" ( %lf , %lf )", &B(i, j).re, &B(i, j).im);
scanf("%*[^\n]");

/* Get the machine precision, using nag_machine_precision (x02ajc) */
eps = nag_machine_precision;
/* Compute one-norm of A nad B using nag_zge_norm (f16uac). */
nag_zge_norm(order, Nag_OneNorm, m, n, a, pda, &norm, &fail);
nag_zge_norm(order, Nag_OneNorm, p, n, b, pdb, &norm, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zge_norm (f16uac).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
tola = MAX(m, n) * norm * eps;
tolb = MAX(p, n) * norm * eps;

/* Compute the factorization of (A, B) A = U*S*(Q^H), B = V*T*(Q^H))
* using using nag_zggsvp (f08vsc).
*/
nag_zggsvp(order, Nag_AllU, Nag_ComputeV, Nag_ComputeQ, m, p, n, a, pda, b,
pdb, tola, tolb, &k, &l, u, pdu, v, pdv, q, pdq, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zggsvp (f08vsc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Print details of the generalizeed SVD */
irank = k + l;
printf("Numerical rank of ( A^H B^H)^H   (k+l)\n%5" NAG_IFMT "\n\n", irank);
nrows = MIN(m, irank);
fflush(stdout);
nag_gen_complx_mat_print_comp(order, Nag_UpperMatrix, Nag_NonUnitDiag,
nrows, irank, &A(1, n - irank + 1), pda,
Nag_BracketForm, "%13.4e", "Matrix S",
Nag_IntegerLabels, 0, Nag_IntegerLabels, 0,
80, 0, 0, &fail);
if (fail.code != NE_NOERROR)
goto FAIL;
printf("\n");
fflush(stdout);
nag_gen_complx_mat_print_comp(order, Nag_UpperMatrix, Nag_NonUnitDiag, l, l,
&B(1, n - l + 1), pdb, Nag_BracketForm,
"%13.4e", "Upper triangular matrix T",
Nag_IntegerLabels, 0, Nag_IntegerLabels, 0,
80, 0, 0, &fail);
if (fail.code != NE_NOERROR)
goto FAIL;
printf("\n");
fflush(stdout);
nag_gen_complx_mat_print_comp(order, Nag_GeneralMatrix, Nag_NonUnitDiag,
m, m, u, pdu, Nag_BracketForm, "%13.4e",
"Unitary matrix U", Nag_IntegerLabels,
0, Nag_IntegerLabels, 0, 80, 0, 0, &fail);
if (fail.code != NE_NOERROR)
goto FAIL;
printf("\n");
fflush(stdout);
nag_gen_complx_mat_print_comp(order, Nag_GeneralMatrix, Nag_NonUnitDiag,
p, p, v, pdv, Nag_BracketForm, "%13.4e",
"Unitary matrix V", Nag_IntegerLabels,
0, Nag_IntegerLabels, 0, 80, 0, 0, &fail);
if (fail.code != NE_NOERROR)
goto FAIL;
printf("\n");
fflush(stdout);
nag_gen_complx_mat_print_comp(order, Nag_GeneralMatrix, Nag_NonUnitDiag,
n, n, q, pdq, Nag_BracketForm, "%13.4e",
"Unitary matrix Q", Nag_IntegerLabels,
0, Nag_IntegerLabels, 0, 80, 0, 0, &fail);
FAIL:
if (fail.code != NE_NOERROR) {
printf("Error from nag_gen_complx_mat_print_comp (x04dbc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

END:
NAG_FREE(a);
NAG_FREE(b);
NAG_FREE(q);
NAG_FREE(u);
NAG_FREE(v);

return exit_status;
}