.\" Copyright (c) 2015-2026, The matio contributors
.\" Copyright (c) 2012-2014, Christopher C. Hulbert
.\" All rights reserved.
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.Dd April 23, 2026
.Dt MAT_VARWRITEDATA 3
.Os
.Sh NAME
.Nm Mat_VarWriteData
.Nd Deprecated variable-write helper that is no longer supported.
.Sh SYNOPSIS
.Fd #include <matio.h>
.Ft int
.Fo Mat_VarWriteData
.Fa "const mat_t *mat"
.Fa "matvar_t *matvar"
.Fa "void *data"
.Fa "const int *start"
.Fa "const int *stride"
.Fa "const int *edge"
.Fc
.Sh DESCRIPTION
The
.Fn Mat_VarWriteData
function remains in the public API for compatibility, but current matio
versions do not support it.
Calls fail and emit a diagnostic directing callers to
.Fn Mat_VarWrite
or, for MAT 7.3 files, to
.Fn Mat_VarWriteAppend .
.Sh DEPRECATED
This function is deprecated since version 1.5.14.
Use \fBMat_VarWrite\fP or, for MAT 7.3 files, \fBMat_VarWriteAppend\fP instead.
.Sh RETURN VALUES
The function returns
.Dv MATIO_E_OPERATION_NOT_SUPPORTED .
.Sh SEE ALSO
.Xr Mat_VarWrite 3 ,
.Xr Mat_VarWriteAppend 3 ,
.Xr Mat_VarWriteInfo 3