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annotate scripts/general/cart2pol.m @ 3803:63c75bc3db82

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[project @ 2001-02-28 08:24:40 by jwe]
author jwe
date Wed, 28 Feb 2001 08:24:43 +0000
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children 22bd65326ec1
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1 ## Copyright (C) 2000 Kai Habel
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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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} [@var{theta}, @var{r}] = cart2pol (@var{x}, @var{y})
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22 ## @deftypefnx {Function File} {} [@var{theta}, @var{r}, @var{z}] = cart2pol (@var{x}, @var{y}, @var{z})
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23 ## Transform cartesian to polar or cylindrical coordinates.
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24 ## @var{x}, @var{y} (and @var{z}) must be of same shape.
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25 ## @var{theta} describes the angle relative to the x - axis.
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26 ## @var{r} is the distance to the z - axis (0, 0, z).
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27 ## @end deftypefn
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28 ## @seealso{pol2cart, cart2sph, sph2cart}
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29
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30 ## Author: Kai Habel <kai.habel@gmx.de>
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31 ## Adapted-by: jwe
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32
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33 function [Theta, R, Z] = cart2pol (X, Y, Z)
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34
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35 if (nargin < 2 || nargin > 3)
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36 error ("cart2pol: number of arguments must be 2 or 3");
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37 endif
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38
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39 if (nargin == 2 && nargout > 2)
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40 error ("cart2pol: number of output arguments must not be greater than number of input arguments");
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41 endif
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42
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43 if ((! (is_matrix (X) && is_matrix (Y)))
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44 || (size (X) != size (Y))
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45 || (nargin == 3 && (! (size (X) == size (Z) && is_matrix (Z)))))
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46 error ("cart2pol: arguments must be matrices of same size");
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47 endif
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48
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49 Theta = atan2 (Y, X);
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50 R = sqrt (X .^ 2 + Y .^ 2);
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51
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52 endfunction