dlacpy.f

          SUBROUTINE DLACPY( UPLO, M, N, A, LDA, B, LDB )
    *
    *  -- LAPACK auxiliary routine (version 3.1) --
    *     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
    *     November 2006
    *
    *     .. Scalar Arguments ..
          CHARACTER          UPLO
          INTEGER            LDA, LDB, M, N
    *     ..
    *     .. Array Arguments ..
          DOUBLE PRECISION   A( LDA, * ), B( LDB, * )
    *     ..
    *
    *  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 ..
          INTEGER            I, J
    *     ..
    *     .. External Functions ..
          LOGICAL            LSAME
          EXTERNAL           LSAME
    *     ..
    *     .. Intrinsic Functions ..
          INTRINSIC          MIN
    *     ..
    *     .. Executable Statements ..
    *
          IF( LSAME( UPLO, 'U' ) ) THEN
             DO 20 J = 1, N
                DO 10 I = 1, MIN( J, M )
                   B( I, J ) = A( I, J )
       10       CONTINUE
       20    CONTINUE
          ELSE IF( LSAME( UPLO, 'L' ) ) THEN
             DO 40 J = 1, N
                DO 30 I = J, M
                   B( I, J ) = A( I, J )
       30       CONTINUE
       40    CONTINUE
          ELSE
             DO 60 J = 1, N
                DO 50 I = 1, M
                   B( I, J ) = A( I, J )
       50       CONTINUE
       60    CONTINUE
          END IF
          RETURN
    *
    *     End of DLACPY
    *
          END