CPOTRS - solve a system of linear equations A*X = B with a
Hermitian positive definite matrix A using the Cholesky
factorization A = U**H*U or A = L*L**H computed by CPOTRF
SYNOPSIS
SUBROUTINE CPOTRS( UPLO, N, NRHS, A, LDA, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
COMPLEX A( LDA, * ), B( LDB, * )
PURPOSE
CPOTRS solves a system of linear equations A*X = B with a
Hermitian positive definite matrix A using the Cholesky
factorization A = U**H*U or A = L*L**H computed by CPOTRF.
ARGUMENTS
UPLO (input) CHARACTER*1
= 'U': Upper triangle of A is stored;
= 'L': Lower triangle of A is stored.
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 triangular factor U or L from the Cholesky
factorization A = U**H*U or A = L*L**H, as com
puted by CPOTRF.
LDA (input) INTEGER
The leading dimension of the array A. LDA >=
max(1,N).
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 i-th argument had an ille
gal value
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