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Re: [Fwd: Re: [OctDev] ndgrid]
From: |
Alexander Barth |
Subject: |
Re: [Fwd: Re: [OctDev] ndgrid] |
Date: |
Tue, 23 May 2006 11:35:47 -0400 |
User-agent: |
Thunderbird 1.5.0.2 (X11/20060501) |
Thanks for pointing that out. Here is the updated version.
Alex
David Bateman wrote:
Alexander Barth wrote:
Hi All,
Here is an implementation of the function ndgrid (a multi-dimensional
extension of meshgrid) that you might want to include in octave.
Any comments?
Cheers,
Alex
This seems to be a fairly clean implementation. The only comment I might
have is that the octave coding style has an indent of 2 spaces in
functions and so the indenting is not quite right. John, as a matlab
core function I'd suggest that this function is committed..
D.
|
## Copyright (C) 2006, Alexander Barth
##
## 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 {Function File} address@hidden, @var{y2}, ..., @var{y}n]} =
ndgrid (@var{x1}, @var{x2}, ..., @var{x}n)
## @deftypefnx {Function File} address@hidden, @var{y2}, ..., @var{y}n]} =
ndgrid (@var{x})
## Given n vectors @var{x1}, ... @var{x}n, ndgrid returns n arrays of dimension
n.
## The elements of the ith output argument contains the elements of the vector
## @var{x}i repeated over all dimensions different from the ith dimension.
## Calling ndgrid with only one input argument @var{x} is equivalent of calling
ndgrid with
## all n input arguments equal to @var{x}:
##
## address@hidden, @var{y2}, ..., @var{y}n] = ndgrid (@var{x}, ..., @var{x})
## @seealso{meshgrid}
## @end deftypefn
## Author: Alexander Barth <address@hidden>
function varargout = ndgrid(varargin)
if (nargin == 1)
n = max([nargout 2]);
## If only one input argument is given, repeat it n-times
varargin{1:n} = varargin{1};
elseif (nargin >= nargout)
n = max([nargin 2]);
else
error ("ndgrid: wrong number of input arguments");
endif
## Determine the size of the output arguments
shape = zeros(1,n);
for i=1:n
if (~isvector(varargin{i}))
error ("ndgrid: arguments must be vectors");
endif
shape(i) = length(varargin{i});
endfor
for i=1:n
## size for reshape
r = ones(1,n);
r(i) = shape(i);
## size for repmat
s = shape;
s(i) = 1;
varargout{i} = repmat(reshape(varargin{i},r) ,s);
endfor
endfunction