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IRIX 6.2 Development Libraries
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csytrs.z
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csytrs
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1996-03-14
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133 lines
CCCCSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) CCCCSSSSYYYYTTTTRRRRSSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
CSYTRS - solve a system of linear equations A*X = B with a complex
symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T
computed by CSYTRF
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE CSYTRS( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
INTEGER IPIV( * )
COMPLEX A( LDA, * ), B( LDB, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
CSYTRS solves a system of linear equations A*X = B with a complex
symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T
computed by CSYTRF.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
UPLO (input) CHARACTER*1
Specifies whether the details of the factorization are stored as
an upper or lower triangular matrix. = 'U': Upper triangular,
form is A = U*D*U**T;
= 'L': Lower triangular, form is A = L*D*L**T.
N (input) INTEGER
The order of the matrix A. N >= 0.
NRHS (input) INTEGER
The number of right hand sides, i.e., the number of columns of
the matrix B. NRHS >= 0.
A (input) COMPLEX array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to obtain
the factor U or L as computed by CSYTRF.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
IPIV (input) INTEGER array, dimension (N)
Details of the interchanges and the block structure of D as
determined by CSYTRF.
B (input/output) COMPLEX array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, the solution
matrix X.
PPPPaaaaggggeeee 1111
CCCCSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) CCCCSSSSYYYYTTTTRRRRSSSS((((3333FFFF))))
LDB (input) INTEGER
The leading dimension of the array B. LDB >= max(1,N).
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
PPPPaaaaggggeeee 2222