e3181f26b1
Changed MPI routines to hypre_MPI routines. Added hypre_printf, etc. routines. Added AUTOTEST tests to look for 'int' and 'MPI_' calls. Added a new approach for the Fortran interface (not implemented everywhere yet).
156 lines
4.0 KiB
C
156 lines
4.0 KiB
C
#include "../blas/hypre_blas.h"
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#include "hypre_lapack.h"
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#include "f2c.h"
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/* Subroutine */ HYPRE_Int dorg2l_(integer *m, integer *n, integer *k, doublereal *
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a, integer *lda, doublereal *tau, doublereal *work, integer *info)
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{
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/* -- LAPACK routine (version 3.0) --
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Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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Courant Institute, Argonne National Lab, and Rice University
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February 29, 1992
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Purpose
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=======
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DORG2L generates an m by n real matrix Q with orthonormal columns,
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which is defined as the last n columns of a product of k elementary
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reflectors of order m
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Q = H(k) . . . H(2) H(1)
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as returned by DGEQLF.
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Arguments
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=========
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M (input) INTEGER
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The number of rows of the matrix Q. M >= 0.
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N (input) INTEGER
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The number of columns of the matrix Q. M >= N >= 0.
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K (input) INTEGER
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The number of elementary reflectors whose product defines the
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matrix Q. N >= K >= 0.
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A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
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On entry, the (n-k+i)-th column must contain the vector which
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defines the elementary reflector H(i), for i = 1,2,...,k, as
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returned by DGEQLF in the last k columns of its array
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argument A.
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On exit, the m by n matrix Q.
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LDA (input) INTEGER
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The first dimension of the array A. LDA >= max(1,M).
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TAU (input) DOUBLE PRECISION array, dimension (K)
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TAU(i) must contain the scalar factor of the elementary
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reflector H(i), as returned by DGEQLF.
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WORK (workspace) DOUBLE PRECISION array, dimension (N)
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INFO (output) INTEGER
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= 0: successful exit
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< 0: if INFO = -i, the i-th argument has an illegal value
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=====================================================================
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Test the input arguments
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Parameter adjustments */
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/* Table of constant values */
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static integer c__1 = 1;
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/* System generated locals */
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integer a_dim1, a_offset, i__1, i__2, i__3;
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doublereal d__1;
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/* Local variables */
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static integer i__, j, l;
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extern /* Subroutine */ HYPRE_Int dscal_(integer *, doublereal *, doublereal *,
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integer *), dlarf_(char *, integer *, integer *, doublereal *,
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integer *, doublereal *, doublereal *, integer *, doublereal *);
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static integer ii;
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extern /* Subroutine */ HYPRE_Int xerbla_(char *, integer *);
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#define a_ref(a_1,a_2) a[(a_2)*a_dim1 + a_1]
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a_dim1 = *lda;
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a_offset = 1 + a_dim1 * 1;
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a -= a_offset;
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--tau;
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--work;
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/* Function Body */
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*info = 0;
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if (*m < 0) {
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*info = -1;
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} else if (*n < 0 || *n > *m) {
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*info = -2;
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} else if (*k < 0 || *k > *n) {
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*info = -3;
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} else if (*lda < max(1,*m)) {
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*info = -5;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_("DORG2L", &i__1);
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return 0;
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}
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/* Quick return if possible */
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if (*n <= 0) {
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return 0;
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}
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/* Initialise columns 1:n-k to columns of the unit matrix */
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i__1 = *n - *k;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *m;
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for (l = 1; l <= i__2; ++l) {
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a_ref(l, j) = 0.;
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/* L10: */
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}
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a_ref(*m - *n + j, j) = 1.;
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/* L20: */
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}
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i__1 = *k;
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for (i__ = 1; i__ <= i__1; ++i__) {
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ii = *n - *k + i__;
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/* Apply H(i) to A(1:m-k+i,1:n-k+i) from the left */
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a_ref(*m - *n + ii, ii) = 1.;
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i__2 = *m - *n + ii;
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i__3 = ii - 1;
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dlarf_("Left", &i__2, &i__3, &a_ref(1, ii), &c__1, &tau[i__], &a[
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a_offset], lda, &work[1]);
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i__2 = *m - *n + ii - 1;
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d__1 = -tau[i__];
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dscal_(&i__2, &d__1, &a_ref(1, ii), &c__1);
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a_ref(*m - *n + ii, ii) = 1. - tau[i__];
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/* Set A(m-k+i+1:m,n-k+i) to zero */
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i__2 = *m;
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for (l = *m - *n + ii + 1; l <= i__2; ++l) {
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a_ref(l, ii) = 0.;
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/* L30: */
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}
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/* L40: */
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}
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return 0;
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/* End of DORG2L */
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} /* dorg2l_ */
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#undef a_ref
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