100 lines
3.0 KiB
Fortran
100 lines
3.0 KiB
Fortran
SUBROUTINE MA02ED( UPLO, N, A, LDA )
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C
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C SLICOT RELEASE 5.0.
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C
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C Copyright (c) 2002-2009 NICONET e.V.
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C
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C This program is free software: you can redistribute it and/or
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C modify it under the terms of the GNU General Public License as
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C published by the Free Software Foundation, either version 2 of
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C the License, or (at your option) any later version.
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C
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C This program is distributed in the hope that it will be useful,
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C but WITHOUT ANY WARRANTY; without even the implied warranty of
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C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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C GNU General Public License for more details.
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C
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C You should have received a copy of the GNU General Public License
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C along with this program. If not, see
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C <http://www.gnu.org/licenses/>.
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C
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C PURPOSE
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C
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C To store by symmetry the upper or lower triangle of a symmetric
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C matrix, given the other triangle.
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C
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C ARGUMENTS
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C
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C Mode Parameters
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C
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C UPLO CHARACTER*1
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C Specifies which part of the matrix is given as follows:
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C = 'U': Upper triangular part;
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C = 'L': Lower triangular part.
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C For all other values, the array A is not referenced.
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C
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C Input/Output Parameters
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C
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C N (input) INTEGER
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C The order of the matrix A. N >= 0.
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C
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C A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
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C On entry, the leading N-by-N upper triangular part
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C (if UPLO = 'U'), or lower triangular part (if UPLO = 'L'),
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C of this array must contain the corresponding upper or
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C lower triangle of the symmetric matrix A.
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C On exit, the leading N-by-N part of this array contains
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C the symmetric matrix A with all elements stored.
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C
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C LDA INTEGER
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C The leading dimension of the array A. LDA >= max(1,N).
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C
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C CONTRIBUTOR
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C
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C V. Sima, Research Institute for Informatics, Bucharest, Romania,
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C Oct. 1998.
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C
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C REVISIONS
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C
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C -
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C
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C ******************************************************************
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C
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C .. Scalar Arguments ..
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CHARACTER UPLO
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INTEGER LDA, N
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C .. Array Arguments ..
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DOUBLE PRECISION A(LDA,*)
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C .. Local Scalars ..
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INTEGER J
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C .. External Functions ..
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LOGICAL LSAME
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EXTERNAL LSAME
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C .. External Subroutines ..
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EXTERNAL DCOPY
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C
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C .. Executable Statements ..
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C
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C For efficiency reasons, the parameters are not checked for errors.
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C
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IF( LSAME( UPLO, 'L' ) ) THEN
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C
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C Construct the upper triangle of A.
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C
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DO 20 J = 2, N
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CALL DCOPY( J-1, A(J,1), LDA, A(1,J), 1 )
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20 CONTINUE
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C
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ELSE IF( LSAME( UPLO, 'U' ) ) THEN
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C
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C Construct the lower triangle of A.
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C
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DO 40 J = 2, N
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CALL DCOPY( J-1, A(1,J), 1, A(J,1), LDA )
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40 CONTINUE
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C
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END IF
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RETURN
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C *** Last line of MA02ED ***
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END
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