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annotate scripts/prefs/ispref.m @ 20818:9d2023d1a63c

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binoinv.m: Implement binary search algorithm for 28X performance increase (bug #34363). * binoinv.m: Call new functions scalar_binoinv or vector_binoinv to calculate binoinv. If there are still uncalculated values then call bin_search_binoinv to perform binary search for remaining values. Add more BIST tests. * binoinv.m (scalar_binoinv): New subfunction to calculate binoinv for scalar x. Stops when x > 1000. * binoinv.m (vector_binoinv): New subfunction to calculate binoinv for scalar x. Stops when x > 1000.
author Lachlan Andrew <lachlanbis@gmail.com>
date Sun, 11 Oct 2015 19:49:40 -0700
parents 03b9d17a2d95
children
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1 ## Copyright (C) 2012-2015 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} ispref (@var{group}, @var{pref})
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21 ## @deftypefnx {Function File} {} ispref (@var{group})
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22 ## Return true if the named preference @var{pref} exists in the preference
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23 ## group @var{group}.
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24 ##
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25 ## The named preference group must be a character string.
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26 ##
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27 ## The preference @var{pref} may be a character string or a cell array of
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28 ## character strings.
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29 ##
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30 ## If @var{pref} is not specified, return true if the preference group
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31 ## @var{group} exists.
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32 ## @seealso{getpref, addpref, setpref, rmpref}
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33 ## @end deftypefn
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34
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35 ## Author: jwe
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36
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37 function retval = ispref (group, pref)
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38
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39 if (nargin == 1)
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40 retval = isfield (loadprefs (), group);
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41 elseif (nargin == 2)
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42 prefs = loadprefs ();
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43 if (isfield (prefs, group))
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44 grp = prefs.(group);
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45 if (ischar (pref) || iscellstr (pref))
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46 retval = isfield (grp, pref);
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47 else
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48 retval = false;
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49 endif
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50 else
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51 retval = false;
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52 endif
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53 else
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54 print_usage ();
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55 endif
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56
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57 endfunction
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58
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59
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60 ## Testing these functions will require some care to avoid wiping out
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61 ## existing (or creating unwanted) preferences for the user running the
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62 ## tests.
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