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1 ## Copyright (C) 2000 Etienne Grossman |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## y = isfield(x,k) |
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18 ## |
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19 ## Returns 1 if x is a struct and k a string, and x.k exists. |
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20 ## Returns 0 otherwise. |
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21 ## |
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22 ## For m****b compat and flexibility. |
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23 ## |
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24 ## See also cmpstruct, fields, setfield, rmfield, getfield, isstruct, |
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25 ## struct. |
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26 |
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27 ## Author: Etienne Grossmann <etienne@isr.ist.utl.pt> |
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28 ## Last modified: January 2000 |
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29 |
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30 function y = isfield(x,k) |
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31 if is_struct(x) |
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32 y = struct_contains (x, k); |
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33 ## eval(sprintf('x.%s;y=1;',k),'y=0;'); |
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34 else |
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35 y = 0 ; |
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36 end |
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37 end |
