zpocon zpotrf zpotri zpotrs zppcon zpptrf zpptri zpptrs

zpotrs() void zpotrs ( char  uplo, int  n, int  nrhs, int  lda, doublecomplex  a[], int  ldb, doublecomplex  b[], int *  info  ) Solution to factorized system of linear equations AX = B for a Hermitian positive definite matrix Purpose This routine solves a system of linear equations A * X = B with a Hermitian positive definite matrix A using the Cholesy factorization A = U^H*U or A = L*L^H computed by zpotrf. Parameters [in] uplo = 'U': Upper triangular factor U is stored in a[][]. = 'L': Lower triangular factor L is stored in a[][]. [in] n Order of the matrix A. (n >= 0) (If n = 0, returns without computation) [in] nrhs Number of right hand sides, i.e., number of columns of the matrix B. (nrhs >= 0) (If nrhs = 0, returns without computation) [in] lda Leading dimension of the two dimensional array a[][]. (lda >= max(1, n)) [in] a[][] Array a[la][lda] (la >= n) The triangular factor U or L from the Cholesky factorization A = U^H*U or A = L*L^H, as computed by zpotrf. [in] ldb Leading dimension of the two dimensional array b[][]. (ldb >= max(1, n)) [in,out] b[][] Array b[lb][ldb] (lb >= nrhs) [in] Right hand side matrix B. [out] Solution matrix X. [out] info = 0: Successful exit = -1: The argument uplo had an illegal value (uplo != 'U' nor 'L') = -2: The argument n had an illegal value (n < 0) = -3: The argument nrhs had an illegal value (nrhs < 0) = -4: The argument lda had an illegal value (lda < max(1, n)) = -6: The argument ldb had an illegal value (ldb < max(1, n)) Reference LAPACK