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113 lines
2.8 KiB
113 lines
2.8 KiB
15 years ago
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#include "clapack.h"
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/* Subroutine */ int dlacpy_(char *uplo, integer *m, integer *n, doublereal *
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a, integer *lda, doublereal *b, integer *ldb)
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{
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/* System generated locals */
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integer a_dim1, a_offset, b_dim1, b_offset, i__1, i__2;
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/* Local variables */
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integer i__, j;
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extern logical lsame_(char *, char *);
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/* -- LAPACK auxiliary routine (version 3.1) -- */
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
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/* November 2006 */
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/* .. Scalar Arguments .. */
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/* .. */
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/* .. Array Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* DLACPY copies all or part of a two-dimensional matrix A to another */
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/* matrix B. */
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/* Arguments */
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/* ========= */
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/* UPLO (input) CHARACTER*1 */
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/* Specifies the part of the matrix A to be copied to B. */
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/* = 'U': Upper triangular part */
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/* = 'L': Lower triangular part */
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/* Otherwise: All of the matrix A */
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/* M (input) INTEGER */
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/* The number of rows of the matrix A. M >= 0. */
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/* N (input) INTEGER */
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/* The number of columns of the matrix A. N >= 0. */
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/* A (input) DOUBLE PRECISION array, dimension (LDA,N) */
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/* The m by n matrix A. If UPLO = 'U', only the upper triangle */
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/* or trapezoid is accessed; if UPLO = 'L', only the lower */
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/* triangle or trapezoid is accessed. */
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/* LDA (input) INTEGER */
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/* The leading dimension of the array A. LDA >= max(1,M). */
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/* B (output) DOUBLE PRECISION array, dimension (LDB,N) */
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/* On exit, B = A in the locations specified by UPLO. */
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/* LDB (input) INTEGER */
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/* The leading dimension of the array B. LDB >= max(1,M). */
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/* ===================================================================== */
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/* .. Local Scalars .. */
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/* .. */
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/* .. External Functions .. */
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/* .. */
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/* .. Intrinsic Functions .. */
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/* .. */
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/* .. Executable Statements .. */
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/* Parameter adjustments */
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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b_dim1 = *ldb;
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b_offset = 1 + b_dim1;
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b -= b_offset;
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/* Function Body */
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if (lsame_(uplo, "U")) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = min(j,*m);
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for (i__ = 1; i__ <= i__2; ++i__) {
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b[i__ + j * b_dim1] = a[i__ + j * a_dim1];
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/* L10: */
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}
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/* L20: */
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}
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} else if (lsame_(uplo, "L")) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *m;
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for (i__ = j; i__ <= i__2; ++i__) {
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b[i__ + j * b_dim1] = a[i__ + j * a_dim1];
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/* L30: */
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}
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/* L40: */
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}
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} else {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *m;
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for (i__ = 1; i__ <= i__2; ++i__) {
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b[i__ + j * b_dim1] = a[i__ + j * a_dim1];
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/* L50: */
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}
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/* L60: */
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}
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}
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return 0;
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/* End of DLACPY */
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} /* dlacpy_ */
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