function mtype = mwrite (filename, A, Z, comments_filename)           %#ok
%MWRITE write a matrix to a file in Matrix Market form.
%
% Example:
%   mtype = mwrite (filename, A, Z, comments_filename)
%
% A can be sparse or full.
%
% If present and non-empty, A and Z must have the same dimension.  Z
% contains the explicit zero entries in the matrix (which MATLAB drops).
% The entries of Z appear as explicit zeros in the output file.  Z is
% optional.  If it is an empty matrix it is ignored.  Z must be sparse or
% empty, if present.  It is ignored if A is full.
%
% filename is the name of the output file.  comments_filename is the file
% whose contents are include after the Matrix Market header and before
% the first data line.  Ignored if an empty string or not present.
%
% See also mread.

 % Copyright 2006-2023, Timothy A. Davis, All Rights Reserved.
 % SPDX-License-Identifier: GPL-2.0+

error ('mwrite mexFunction not found') ;