dlacpy.c

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/* DLACPY.F -- translated by f2c (version 19941215).
   You must link the resulting object file with the libraries:
        -lf2c -lm   (in that order)
*/

#include "f2c.h"

/* Subroutine */ int dlacpy_(uplo, m, n, a, lda, b, ldb, uplo_len)
char *uplo;
integer *m, *n;
doublereal *a;
integer *lda;
doublereal *b;
integer *ldb;
ftnlen uplo_len;
{
    /* System generated locals */
    integer a_dim1, a_offset, b_dim1, b_offset, i__1, i__2;

    /* Local variables */
    static integer i, j;
    extern logical lsame_();


/*  -- LAPACK auxiliary routine (version 1.1) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd., */
/*     Courant Institute, Argonne National Lab, and Rice University */
/*     February 29, 1992 */

/*     .. Scalar Arguments .. */
/*     .. */
/*     .. Array Arguments .. */
/*     .. */

/*  Purpose */
/*  ======= */

/*  DLACPY copies all or part of a two-dimensional matrix A to another */
/*  matrix B. */

/*  Arguments */
/*  ========= */

/*  UPLO    (input) CHARACTER*1 */
/*          Specifies the part of the matrix A to be copied to B. */
/*          = 'U':      Upper triangular part */
/*          = 'L':      Lower triangular part */
/*          Otherwise:  All of the matrix A */

/*  M       (input) INTEGER */
/*          The number of rows of the matrix A.  M >= 0. */

/*  N       (input) INTEGER */
/*          The number of columns of the matrix A.  N >= 0. */

/*  A       (input) DOUBLE PRECISION array, dimension (LDA,N) */
/*          The m by n matrix A.  If UPLO = 'U', only the upper triangle 
*/
/*          or trapezoid is accessed; if UPLO = 'L', only the lower */
/*          triangle or trapezoid is accessed. */

/*  LDA     (input) INTEGER */
/*          The leading dimension of the array A.  LDA >= max(1,M). */

/*  B       (output) DOUBLE PRECISION array, dimension (LDB,N) */
/*          On exit, B = A in the locations specified by UPLO. */

/*  LDB     (input) INTEGER */
/*          The leading dimension of the array B.  LDB >= max(1,M). */

/*  ===================================================================== 
*/

/*     .. Local Scalars .. */
/*     .. */
/*     .. External Functions .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Executable Statements .. */

    /* Parameter adjustments */
    a_dim1 = *lda;
    a_offset = a_dim1 + 1;
    a -= a_offset;
    b_dim1 = *ldb;
    b_offset = b_dim1 + 1;
    b -= b_offset;

    /* Function Body */
    if (lsame_(uplo, "U", 1L, 1L)) {
        i__1 = *n;
        for (j = 1; j <= i__1; ++j) {
            i__2 = min(j,*m);
            for (i = 1; i <= i__2; ++i) {
                b[i + j * b_dim1] = a[i + j * a_dim1];
/* L10: */
            }
/* L20: */
        }
    } else if (lsame_(uplo, "L", 1L, 1L)) {
        i__1 = *n;
        for (j = 1; j <= i__1; ++j) {
            i__2 = *m;
            for (i = j; i <= i__2; ++i) {
                b[i + j * b_dim1] = a[i + j * a_dim1];
/* L30: */
            }
/* L40: */
        }
    } else {
        i__1 = *n;
        for (j = 1; j <= i__1; ++j) {
            i__2 = *m;
            for (i = 1; i <= i__2; ++i) {
                b[i + j * b_dim1] = a[i + j * a_dim1];
/* L50: */
            }
/* L60: */
        }
    }
    return 0;

/*     End of DLACPY */

} /* dlacpy_ */

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