coo_csc coo_csr coo_dense csc_coo csc_csr csc_dense csc_ssc csr_coo csr_dense csr_ssr dense_coo dense_csc dense_csr ssc_csc ssr_csr

csr_ssr() void csr_ssr ( char  uplo, int  n, const double  val[], const int  rowptr[], const int  colind[], int  base, int  maxnnz2, double  val2[], int  rowptr2[], int  colind2[], int  base2, int *  info  ) CSR (symmetric full matrix) -> SSR (CSR sparse matrix packed form) Purpose This routine converts the general CSR sparse matrix containing all elements to the symmetric CSR sparse matrix containing only upper or lower triangular elements. In current version, the triangular elements (not including diagonal elements) other than specified by uplo in input matrix will be simply ignored, and it is not tested if it is symmetric matrix. Parameters [in] uplo Specifies whether the upper or lower triangular part is stored in the output matrix. = 'U': Upper triangular part. = 'L': Lower triangular part. [in] n Number of rows and columns of matrix. (n >= 0) (if n = 0, returns without computation) [in] val[] Array val[lval] (lval >= nnz) Values of nonzero elements of input matrix (where nnz is the number of nonzero elements). [in] rowptr[] Array rowptr[lrowptr] (lrowptr >= n + 1) Row pointers of input matrix. [in] colind[] Array colind[lcolind] (lcolind >= nnz) Column indices of input matrix (where nnz is the number of nonzero elements). [in] base Indexing of rowptr[] and colind[]. = 0: Zero-based (C style) indexing: Starting index is 0. = 1: One-based (Fortran style) indexing: Starting index is 1. [in] maxnnz2 Size of arrays val2[] and colind2[] (must be greater than the number of nonzero elements of the upper or lower triangular part of input matrix). (maxnnz2 > 0) [out] val2[] Array val2[lval2] (lval2 >= maxnnz2) Values of nonzero elements of output matrix. [out] rowptr2[] Array rowptr2[lrowptr2] (lrowptr2 >= n + 1) Row pointers of output matrix. [out] colind2[] Array colind2[lcolind2] (lcolind2 >= maxnnz2) Column indices of output matrix. [in] base2 Indexing of rowptr2[] and colind2[]. = 0: Zero-based (C style) indexing: Starting index is 0. = 1: One-based (Fortran style) indexing: Starting index is 1. [out] info = 0: Successful exit. = i < 0: The (-i)-th argument is invalid. = j > 0: j elements in input matrix were ignored.