Mercurial > hg > octave-lyh
annotate scripts/io/is_valid_file_id.m @ 14383:07c55bceca23 stable
Fix guarded_eval() subfunction in fminunc (bug #35534).
* fminunc.m: Fix guarded_eval() subfunction in fminunc (bug #35534).
| author | Olaf Till <olaf.till@uni-jena.de> |
|---|---|
| date | Wed, 15 Feb 2012 14:44:37 +0100 |
| parents | 72c96de7a403 |
| children | f3d52523cde1 |
| rev | line source |
|---|---|
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72c96de7a403
maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2010-2012 John W. Eaton |
| 11142 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
| 20 ## @deftypefn {Function File} {} is_valid_file_id (@var{fid}) | |
| 21 ## Return true if @var{fid} refers to an open file. | |
| 22 ## @seealso{fopen} | |
| 23 ## @end deftypefn | |
| 24 | |
| 25 function retval = is_valid_file_id (fid) | |
| 26 | |
| 27 retval = false; | |
| 28 | |
| 29 if (nargin == 1) | |
| 30 try | |
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31 if (isscalar (fid)) |
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32 [file, mode, arch] = fopen (fid); |
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33 retval = ! isempty (file); |
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John W. Eaton <jwe@octave.org>
parents:
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34 endif |
| 11142 | 35 end_try_catch |
| 36 else | |
| 37 print_usage (); | |
| 38 endif | |
| 39 | |
| 40 endfunction | |
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John W. Eaton <jwe@octave.org>
parents:
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41 |
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parents:
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42 %!assert (is_valid_file_id (stdout)) |
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John W. Eaton <jwe@octave.org>
parents:
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43 %!assert (! is_valid_file_id ([1,2;3,4])) |
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461ae8d58cdb
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John W. Eaton <jwe@octave.org>
parents:
11142
diff
changeset
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44 %!assert (! is_valid_file_id ("not_a_file_id")) |
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461ae8d58cdb
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John W. Eaton <jwe@octave.org>
parents:
11142
diff
changeset
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45 %!assert (! is_valid_file_id (-1)) |
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461ae8d58cdb
tests for is_valid_file_id
John W. Eaton <jwe@octave.org>
parents:
11142
diff
changeset
|
46 %!assert (! is_valid_file_id (pi)) |