/usr/share/cantor/octavebackend/cantor_plot2d.m is in cantor-backend-octave 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2010 Miha Čančula <miha.cancula@gmail.com>
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
%}
function cantor_plot2d(f_string,var,min,max)
f_mod_string = f_string;
for op = ['*' '/' '^']
f_mod_string = strrep(f_mod_string, op, strcat('.',op));
endfor
f = inline(f_mod_string, var);
x = linspace(min,max);
plot (x, f(x));
xlabel(var);
ylabel(f_string);
cantor_print();
endfunction
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