hb_read hb_write mm_read mm_write readgmsh22 readmesh readmsh2 readmsh3 writecsv2 writecsv3 writegmsh22 writevtkug

mm_write() void mm_write ( char *  fname, char *  matcode, int  nrow, int  ncol, int  nnz, double  val[], int  lval, int  ptr[], int  lptr, int  ind[], int  lind, int  base, int  fchk, int  format, int *  info  ) Write a matrix to the Matrix Market file Purpose This function writes a sparse (CSR, CSC or COO format) or dense matrix to the Matrix Market file. The data is written as it is without checking the contents. Parameters [in] fname Input file name. If fname = NULL, stdout is assumed. [in] matcode[] Array matcode[4] Matrix type code. matcode[0]: = 'M': matrix. matcode[1]: Storage format. = 'C': sparse matrix (CSC format). = 'A': dense matrix (column major). matcode[2]: Data type. = 'R': real. = 'I': integer. = 'C': complex. = 'P': pattern (Only rowind and colind are stored. Data (val) is not stored). matcode[3]: Matrix shape. = 'G': genaral matrix. = 'S': symmetric matrix. = 'Z': skew-symmetric matrix. = 'H': Hermitian matrix. [in] nrow Number of rows of the matrix. (nrow >= 0) (If nrow = 0, returns without computation) [in] ncol Number of columns of the matrix. (ncol >= 0) (If ncol = 0, returns without computation) [in] nnz Number of nonzero elements of the matrix. (nnz >= 0) (If nnz = 0, returns without computation) [in] val[] Array val[lval] Nonzero elements of sparse matrix, or, all elements of dense matrix. If data type is integer, the value will be rounded when writing. Not referenced if matcode[2] = 'P'. [in] lval Length of array val[]. (lval is as follows) storage format data type matrix shape lval (min. value) -------------- ----------------- ------------ ----------------- sparse, real or integer: nnz complex: 2*nnz dense, real or integer, general: nrow*ncol symmetric: ncol*(ncol + 1)/2 skew: ncol*(ncol - 1)/2 complex, general: 2*nrow*ncol symmetric: ncol*(ncol + 1) skew: ncol*(ncol - 1) Hermitian: ncol*(ncol + 1) [in] ptr[] Array ptr[lptr] Row pointers (if matrix is stored in CSR format), column pointers (if matrix is stored in CSC format) or row indices (if matrix is stored in COO format) of nonzero elements. Not referenced if matcode[1] = 'A'. [in] lptr Length of array ptr[]. (lptr >= ncol + 1 (if matrix is stored in CSC format), lptr >= nrow + 1 (if matrix is stored in CSR format) or lptr >= nnz (if matrix is stored in COO format)) [in] ind[] Array ind[lind] Row indices (if matrix is stored in CSC format) or column indices (if matrix is stored in CSR or COO format) of nonzero elements. Not referenced if matcode[1] = 'A'. [in] lind Length of array ind[]. (lind >= nnz) [in] base Indexing of rowind[] and colind[]. = 0: Zero-based (C style) indexing: Starting index is 0. = 1: One-based (Fortran style) indexing: Starting index is 1. [in] fchk Specify whether to check if the specified file already exists. = 0: Overwrites without checking. = 1: Returns an error (info = 2) if the specified file already exists. [in] format Sparse input matrix format. = 0: CSR format. = 1: CSC format. = 2: COO format. [out] info = 0: Successful exit. < 0: The (-info)-th argument is invalid. = 1: Failed to open file. = 2: File already exists.