Mercurial > hg > octave-nkf
diff scripts/miscellaneous/getfield.m @ 5820:27c966e4b2dc
[project @ 2006-05-17 21:00:54 by jwe]
author | jwe |
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date | Wed, 17 May 2006 21:00:54 +0000 |
parents | |
children | 18344a472daf |
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new file mode 100644 --- /dev/null +++ b/scripts/miscellaneous/getfield.m @@ -0,0 +1,62 @@ +## Copyright (C) 2000 Etienne Grossmann +## +## 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 2, 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, write to the Free +## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +## 02110-1301, USA. + +## -*- texinfo -*- +## @deftypefn {Built-in Function} {} [@var{v1},...] = +## @code{getfield (@var{s}, 'k1',...)} extract fields from a structure. +## For example +## +## @example +## @group +## ss(1,2).fd(3).b=5; +## getfield(ss,@{1,2@},'fd',@{3@},'b') +## @result{} ans = 5 +## @end group +## @end example +## +## Note that this function could be written as +## +## @example +## i1= @{1,2@}; i2= 'fd'; i3= @{3@}; i4= 'b'; +## ss( i1@{:@} ).( i2 )( i3@{:@} ).( i4 ) +## @end example +## @seealso{setfield,rmfield,isfield,isstruct,fields,struct} +## @end deftypefn + +## Author: Etienne Grossmann <etienne@cs.uky.edu> + +function s = getfield (s, varargin) + + for idx = 1:nargin-1 + i = varargin{idx}; + if (iscell (i)) + s = s(i{:}); + else + s = s.(i); + endif + endfor + +endfunction + +%!test +%! x.a = "hello"; +%! assert(getfield(x,"a"),"hello"); +%!test +%! ss(1,2).fd(3).b = 5; +%! assert(getfield(ss,{1,2},'fd',{3},'b'),5)