
SPOTRS(l) ) SPOTRS(l)
NAME
SPOTRS  solve a system of linear equations A*X = B with a symmetric positive definite
matrix A using the Cholesky factorization A = U**T*U or A = L*L**T computed by SPOTRF
SYNOPSIS
SUBROUTINE SPOTRS( UPLO, N, NRHS, A, LDA, B, LDB, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, LDB, N, NRHS
REAL A( LDA, * ), B( LDB, * )
PURPOSE
SPOTRS solves a system of linear equations A*X = B with a symmetric positive definite
matrix A using the Cholesky factorization A = U**T*U or A = L*L**T computed by SPOTRF.
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) REAL array, dimension (LDA,N)
The triangular factor U or L from the Cholesky factorization A = U**T*U or A =
L*L**T, as computed by SPOTRF.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
B (input/output) REAL 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
LAPACK version 3.0 15 June 2000 SPOTRS(l) 
