Mercurial > hg > octave-nkf
view scripts/strings/index.m @ 14570:d07d96e53612 stable
seconds after the minute can be 0-60, not 0-61
* system.txi (Timing Utilities): Correct possible values for number of
seconds in time structures. From Rafael Arndt <rafaelarndt@gmail.com>.
author | John W. Eaton <jwe@octave.org> |
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date | Tue, 17 Apr 2012 14:42:49 -0400 |
parents | 4d917a6a858b |
children | f3d52523cde1 |
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## Copyright (C) 1996-2012 Kurt Hornik ## ## 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} {} index (@var{s}, @var{t}) ## @deftypefnx {Function File} {} index (@var{s}, @var{t}, @var{direction}) ## Return the position of the first occurrence of the string @var{t} in the ## string @var{s}, or 0 if no occurrence is found. @var{s} may also be a ## string array or cell array of strings. ## ## For example: ## ## @example ## @group ## index ("Teststring", "t") ## @result{} 4 ## @end group ## @end example ## ## If @var{direction} is @samp{"first"}, return the first element found. ## If @var{direction} is @samp{"last"}, return the last element found. ## ## @seealso{find, rindex} ## @end deftypefn ## Author: Kurt Hornik <Kurt.Hornik@wu-wien.ac.at> ## Adapted-By: jwe ## This is patterned after the AWK function of the same name. function n = index (s, t, direction = "first") if (nargin < 2 || nargin > 3) print_usage (); endif if (ischar (s)) if (! isrow (s)) s = cellstr (s); # Handle string arrays by conversion to cellstr endif elseif (! iscellstr (s)) error ("index: S must be a string, string array, or cellstr"); endif f = strfind (s, t); if (isempty (f)) f = 0; elseif (iscell (f)) f(cellfun ("isempty", f)) = {0}; endif direction = tolower (direction); if (strcmp (direction, "first")) if (iscell (f)) n = cellfun ("min", f); else n = f(1); endif elseif (strcmp (direction, "last")) if (iscell (f)) n = cellfun ("max", f); else n = f(end); endif else error ('index: DIRECTION must be either "first" or "last"'); endif endfunction %!assert (index ("foobarbaz", "b") == 4 && index ("foobarbaz", "z") == 9); %!assert (index("astringbstringcstring", "s"), 2) %!assert (index("astringbstringcstring", "st"), 2) %!assert (index("astringbstringcstring", "str"), 2) %!assert (index("astringbstringcstring", "string"), 2) %!assert (index("abc---", "abc+++"), 0) ## test everything out in reverse %!assert (index("astringbstringcstring", "s", "last"), 16) %!assert (index("astringbstringcstring", "st", "last"), 16) %!assert (index("astringbstringcstring", "str", "last"), 16) %!assert (index("astringbstringcstring", "string", "last"), 16) %!assert (index("abc---", "abc+++", "last"), 0) %!test %! str = char ("Hello", "World", "Goodbye", "World"); %! assert (index (str, "o"), [5; 2; 2; 2]); %! assert (index (str, "o", "last"), [5; 2; 3; 2]); %! str = cellstr (str); %! assert (index (str, "o"), [5; 2; 2; 2]); %! assert (index (str, "o", "last"), [5; 2; 3; 2]); %% Test input validation %!error index () %!error index ("a") %!error index ("a", "b", "first", "d") %!error index (1, "bar") %!error index ("foo", "bar", 3)