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## Copyright (C) 2011-2025 L. Markowsky <lmarkowsky@gmail.com>
##
## This file is part of the fuzzy-logic-toolkit.
##
## The fuzzy-logic-toolkit is free software; you can redistribute it
## and/or modify it under the terms of the GNU General Public License
## as published by the Free Software Foundation; either version 3 of
## the License, or (at your option) any later version.
##
## The fuzzy-logic-toolkit is distributed in the hope that it will be
## useful, but WITHOUT ANY WARRANTY; without even the implied warranty
## of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with the fuzzy-logic-toolkit; see the file COPYING. If not,
## see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{y} =} is_format (@var{x})
##
## Return true if @var{x} is one of the strings 'verbose', 'symbolic', and
## 'indexed', and return false otherwise. The comparison is case-insensitive.
##
## is_format is a private function that localizes the test for valid fis rule
## input/output formats.
##
## @end deftypefn
## Author: L. Markowsky
## Keywords: fuzzy-logic-toolkit fuzzy private parameter-test
## Directory: fuzzy-logic-toolkit/inst/private/
## Filename: is_format.m
## Last-Modified: 10 Jun 2024
function y = is_format (x)
y = ischar (x) && isvector (x) && ...
ismember (tolower (x), {'verbose', 'symbolic', 'indexed'});
endfunction
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