88 lines
2.4 KiB
Fortran
88 lines
2.4 KiB
Fortran
SUBROUTINE DLACPY( UPLO, M, N, A, LDA, B, LDB )
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*
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* -- LAPACK auxiliary routine (version 2.0) --
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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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*
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* .. Scalar Arguments ..
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CHARACTER UPLO
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INTEGER LDA, LDB, M, N
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* ..
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* .. Array Arguments ..
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DOUBLE PRECISION A( LDA, * ), B( LDB, * )
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* ..
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*
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* Purpose
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* =======
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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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*
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* Arguments
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* =========
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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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*
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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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*
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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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*
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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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*
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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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*
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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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*
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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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* =====================================================================
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*
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* .. Local Scalars ..
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INTEGER I, J
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* ..
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* .. External Functions ..
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LOGICAL LSAME
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EXTERNAL LSAME
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC MIN
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* ..
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* .. Executable Statements ..
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*
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IF( LSAME( UPLO, 'U' ) ) THEN
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DO 20 J = 1, N
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DO 10 I = 1, MIN( J, M )
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B( I, J ) = A( I, J )
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10 CONTINUE
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20 CONTINUE
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ELSE IF( LSAME( UPLO, 'L' ) ) THEN
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DO 40 J = 1, N
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DO 30 I = J, M
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B( I, J ) = A( I, J )
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30 CONTINUE
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40 CONTINUE
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ELSE
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DO 60 J = 1, N
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DO 50 I = 1, M
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B( I, J ) = A( I, J )
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50 CONTINUE
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60 CONTINUE
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END IF
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RETURN
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*
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* End of DLACPY
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*
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END
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