spfmt - Specifies the sparse storage format used for representing the sparse matrix. The supported formats are S3L_SPARSE_COO and S3L_SPARSE_CSR.
m - Indicates the total number of rows in the sparse matrix.
n - Indicates the total number of columns in the sparse matrix.
nnz - Indicates the total number of nonzero elements in the sparse matrix.
type - The type of the sparse array, which must be one of: S3L_float, S3L_double, S3L_complex, or S3L_dcomplex.
fname - Scalar character variable that names the ASCII file containing the sparse matrix data.
dfmt - Specifies the format of the data to be read from the data file. The supported format is ASCII.