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IRIX 6.2 Development Libraries
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SGI IRIX 6.2 Development Libraries.iso
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sgetrs.z
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sgetrs
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1996-03-14
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133 lines
SSSSGGGGEEEETTTTRRRRSSSS((((3333FFFF)))) SSSSGGGGEEEETTTTRRRRSSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
SGETRS - solve a system of linear equations A * X = B or A' * X = B with
a general N-by-N matrix A using the LU factorization computed by SGETRF
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE SGETRS( TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
CHARACTER TRANS
INTEGER INFO, LDA, LDB, N, NRHS
INTEGER IPIV( * )
REAL A( LDA, * ), B( LDB, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
SGETRS solves a system of linear equations
A * X = B or A' * X = B with a general N-by-N matrix A using the LU
factorization computed by SGETRF.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
TRANS (input) CHARACTER*1
Specifies the form of the system of equations:
= 'N': A * X = B (No transpose)
= 'T': A'* X = B (Transpose)
= 'C': A'* X = B (Conjugate transpose = Transpose)
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 factors L and U from the factorization A = P*L*U as computed
by SGETRF.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
IPIV (input) INTEGER array, dimension (N)
The pivot indices from SGETRF; for 1<=i<=N, row i of the matrix
was interchanged with row IPIV(i).
B (input/output) REAL array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, the solution
matrix X.
PPPPaaaaggggeeee 1111
SSSSGGGGEEEETTTTRRRRSSSS((((3333FFFF)))) SSSSGGGGEEEETTTTRRRRSSSS((((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