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IRIX 6.2 Development Libraries
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ssytrs.z
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ssytrs
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1996-03-14
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133 lines
SSSSSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) SSSSSSSSYYYYTTTTRRRRSSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
SSYTRS - solve a system of linear equations A*X = B with a real symmetric
matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by
SSYTRF
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE SSYTRS( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
INTEGER IPIV( * )
REAL A( LDA, * ), B( LDB, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
SSYTRS solves a system of linear equations A*X = B with a real symmetric
matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by
SSYTRF.
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) REAL array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to obtain
the factor U or L as computed by SSYTRF.
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 SSYTRF.
B (input/output) REAL array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, the solution
matrix X.
PPPPaaaaggggeeee 1111
SSSSSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) SSSSSSSSYYYYTTTTRRRRSSSS((((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