csc_ilu csc_ilu0 csc_ilu_solve csc_ssor_solve csr_ilu csr_ilu0 csr_ilu_solve csr_ssor_solve csx_ds csx_ds_solve csx_ssor

csc_ilu_solve() void csc_ilu_solve ( char  trans, int  n, const double  val[], const int  colptr[], const int  rowind[], int  base, const double  d[], const double  b[], double  x[], int *  info  ) Incomplete LU decomposition preconditioner (ILU) (CSC) Purpose This routine is the incomplete LU decomposition preconditioner (ILU) for the sparse linear equations. It solves the equation M*x = b or M^T*x = b, where M is the preconditioner matrix. Parameters [in] trans = 'N': solve M*x = b. = 'T' or 'C': solve M^T*x = b. [in] n Dimension of preconditioner matrix. (n >= 0) (If n = 0, returns without computation) [in] val[] Array val[lval] (lval >= nnz) (nnz is number of non-zero elements) Values of non-zero elements of preconditioner matrix (lower triangular matrix L and upper triangular matrix U). [in] colptr[] Array colptr[lcolptr] (lcolptr >= n + 1) Column pointers of preconditioner matrix. [in] rowind[] Array rowind[lrowind] (lrowind >= nnz) Row indices of preconditioner matrix. [in] base Indexing of colptr[] and rowind[]. = 0: Zero-based (C style) indexing: Starting index is 0. = 1: One-based (Fortran style) indexing: Starting index is 1. [in] d[] Array d[ld] (ld >= n) The diagonal elements of upper triangular matrix U. [in] b[] Array b[lb] (lb >= n) Right hand side vector b. [out] x[] Array x[lx] (lx >= n) Solution vector x. [out] info = 0: Successful exit. = i < 0: The (-i)-th argument is invalid.