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IRIX 6.2 Development Libraries
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zsytrs.z
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zsytrs
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1996-03-14
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133 lines
ZZZZSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) ZZZZSSSSYYYYTTTTRRRRSSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
ZSYTRS - 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 ZSYTRF
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE ZSYTRS( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
INTEGER IPIV( * )
COMPLEX*16 A( LDA, * ), B( LDB, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
ZSYTRS 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 ZSYTRF.
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*16 array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to obtain
the factor U or L as computed by ZSYTRF.
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 ZSYTRF.
B (input/output) COMPLEX*16 array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, the solution
matrix X.
PPPPaaaaggggeeee 1111
ZZZZSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) ZZZZSSSSYYYYTTTTRRRRSSSS((((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