/usr/share/freemat/toolbox/array/isdigit.m is in freemat-data 4.0-5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | % ISDIGIT ISDIGIT Test for Digit Characters in a String
%
% Usage
%
% The isdigit functions returns a logical array that is 1
% for characters in the argument string that are digits, and
% is a logical 0 for characters in the argument that are not
% digits. The syntax for its use is
%
% x = isdigit(s)
%
% where s is a string.
% Copyright (c) 2002-2007 Samit Basu
% Licensed under the GPL
function x = isdigit(s)
s = int32(string(s));
x = ((s >=48 ) & (s <= 57));
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