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