CscCheck CsrCheck ZCscCheck ZCsrCheck

CscCheck() Sub CscCheck ( M As  Long, N As  Long, Val() As  Double, Ptr() As  Long, Ind() As  Long, Result() As  Long, Info As  Long  ) Check sparse matrix (CSC) Purpose This routine checks the sparse matrix in CSC format. Parameters [in] M Number of rows of the matrix. (M >= 0) (If M = 0, returns without computation) [in] N Number of columns of the matrix. (N >= 0) (If N = 0, returns without computation) [in] Val() Array Val(LVal - 1) (LVal >= Nnz) (Nnz is the number of nonzero elements of the matrix) Values of nonzero elements of the matrix. [in] Ptr() Array Ptr(LPtr - 1) (LPtr >= N + 1 (CSC), LPtr >= M + 1 (CSR)) Column pointers of the matrix. [in] Ind() Array Ind(LInd - 1) (LInd >= Nnz) (Nnz is the number of nonzero elements of the matrix) Row indices of the matrix. [out] Result() Array Result(LResult - 1) (LResult >= 10) Check result (valid for 0 <= info <= 15). Result(0): Symmetry (0: nonsymmetric matrix, 1: symmetric matrix) Result(1): Number of nonzero elements. (= Ptr(M) - Ptr(0)) Result(2): Number of nonzero elements in lower triangular part. Result(3): Number of nonzero elements in upper triangular part. Result(4): Number of nonzero diagonal elements. Result(5): Number of elements with zero values (Val = 0). Result(6): Number of diagonal elements with zero values (Val = 0). Result(7): Number of empty columns . Result(8): Number of columns with unsorted row indices. Result(9): Number of invaid row indices. [out] Info = 0: Successful exit. = i < 0: The (-i)-th argument is invalid. = 1: Empty column(s) found.(*) = 2: Column(s) with unsorted row indices found.(*) = 4: Diagonal elements with zero values (val = 0) found.(*) = 8: Invalid row index(es) found.(*) (*) Sum of these codes will be returned (e.g. 15 = 1 + 2 + 4 + 8 indicates that all four cases were detected). = 16: The value of Ptr(0) is invalid. = 17: The value of (Ptr(M) - Ptr(0)) is invalid. = 18: the value(s) of Ptr(i)(i > 0) are invalid.