home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
IRIX 6.2 Development Libraries
/
SGI IRIX 6.2 Development Libraries.iso
/
dist
/
complib.idb
/
usr
/
share
/
catman
/
p_man
/
cat3
/
complib
/
dsytrs.z
/
dsytrs
Wrap
Text File
|
1996-03-14
|
3KB
|
133 lines
DDDDSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) DDDDSSSSYYYYTTTTRRRRSSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
DSYTRS - 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
DSYTRF
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE DSYTRS( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
INTEGER IPIV( * )
DOUBLE PRECISION A( LDA, * ), B( LDB, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
DSYTRS 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
DSYTRF.
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) DOUBLE PRECISION array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to obtain
the factor U or L as computed by DSYTRF.
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 DSYTRF.
B (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, the solution
matrix X.
PPPPaaaaggggeeee 1111
DDDDSSSSYYYYTTTTRRRRSSSS((((3333FFFF)))) DDDDSSSSYYYYTTTTRRRRSSSS((((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