SUBROUTINE DLACPY( UPLO, M, N, A, LDA, B, LDB ) * * -- LAPACK auxiliary routine (version 3.2) -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver 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