cgetrs (l)  Linux Man Pages
cgetrs: solves a system of linear equations A * X = B, A**T * X = B, or A**H * X = B with a general NbyN matrix A using the LU factorization computed by CGETRF
NAME
CGETRS  solves a system of linear equations A * X = B, A**T * X = B, or A**H * X = B with a general NbyN matrix A using the LU factorization computed by CGETRFSYNOPSIS
 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, * )
PURPOSE
CGETRS solves a system of linear equationsA
ARGUMENTS
 TRANS (input) CHARACTER*1

Specifies the form of the system of equations:
= aqNaq: A * X = B (No transpose)
= aqTaq: A**T * X = B (Transpose)
= aqCaq: 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.
 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 ith argument had an illegal value