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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{x}, @var{y}, @var{z}] = sph2cart (@var{theta}, @var{phi}, @var{r}) |
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22 ## Transform spherical to cartesian coordinates. |
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23 ## @var{x}, @var{y} and @var{z} must be of same shape. |
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24 ## @var{theta} describes the angle relative to the x-axis. |
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25 ## @var{phi} is the angle relative to the xy-plane. |
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26 ## @var{r} is the distance to the origin (0, 0, 0). |
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27 ## @end deftypefn |
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28 ## @seealso{pol2cart, cart2pol, cart2sph} |
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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 [X, Y, Z] = sph2cart (Theta, Phi, R) |
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34 |
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35 if (nargin != 3) |
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36 usage ("[X, Y, Z] = sph2cart (Theta, Phi, R)"); |
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37 endif |
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38 |
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39 if ((! (ismatrix (Theta) && ismatrix (Phi) && ismatrix (R))) |
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40 || size (Theta) != size (Phi) |
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41 || size (Theta) != size (R)) |
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42 error ("sph2cart: arguments must be matrices of same size"); |
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43 endif |
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44 |
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45 X = R .* cos (Phi) .* cos (Theta); |
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46 Y = R .* cos (Phi) .* sin (Theta); |
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47 Z = R .* sin (Phi); |
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48 |
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49 endfunction |