Mercurial > octave-nkf
view scripts/io/is_valid_file_id.m @ 20584:eb9e2d187ed2
maint: Use Octave coding conventions in scripts/ode/private dir.
* AbsRel_Norm.m, fuzzy_compare.m, hermite_quartic_interpolation.m,
integrate_adaptive.m, integrate_const.m, integrate_n_steps.m, kahan.m,
ode_struct_value_check.m, odepkg_event_handle.m, odepkg_structure_check.m,
runge_kutta_45_dorpri.m, starting_stepsize.m:
Wrap long lines to < 80 chars.
Use double quotes rather than single quotes where possible.
Use ';' at end of keywords "return;" and "break;"
Use '##" for stand-alone comments and '#' for end-of-line comments.
Use two spaces after period before starting new sentence.
Use '!' instead of '~' for logical negation.
Use specific form of end (endif, endfor, etc.).
Don't use line continuation marker '...' unless necessary.
| author | Rik <rik@octave.org> |
|---|---|
| date | Sun, 04 Oct 2015 22:18:54 -0700 |
| parents | 4197fc428c7d |
| children |
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## Copyright (C) 2010-2015 John W. Eaton ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} is_valid_file_id (@var{fid}) ## Return true if @var{fid} refers to an open file. ## @seealso{freport, fopen} ## @end deftypefn function retval = is_valid_file_id (fid) retval = false; if (nargin == 1) try if (isscalar (fid)) [file, mode, arch] = fopen (fid); retval = ! isempty (file); endif end_try_catch else print_usage (); endif endfunction %!assert (is_valid_file_id (stdout)) %!assert (! is_valid_file_id ([1,2;3,4])) %!assert (! is_valid_file_id ("not_a_file_id")) %!assert (! is_valid_file_id (-1)) %!assert (! is_valid_file_id (pi))