Mercurial > octave
annotate scripts/general/sph2cart.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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27919
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update Octave Project Developers copyright for the new year
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1 ## Copyright (C) 2000-2020 The Octave Project Developers |
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2 ## |
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3 ## See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 ## or <https://octave.org/COPYRIGHT.html/>. |
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5 ## |
3803 | 6 ## |
7 ## This file is part of Octave. | |
8 ## | |
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9 ## Octave is free software: you can redistribute it and/or modify it |
3803 | 10 ## under the terms of the GNU General Public License as published by |
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11 ## the Free Software Foundation, either version 3 of the License, or |
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12 ## (at your option) any later version. |
3803 | 13 ## |
14 ## Octave is distributed in the hope that it will be useful, but | |
15 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 ## GNU General Public License for more details. |
3803 | 18 ## |
19 ## You should have received a copy of the GNU General Public License | |
7016 | 20 ## along with Octave; see the file COPYING. If not, see |
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21 ## <https://www.gnu.org/licenses/>. |
3803 | 22 |
23 ## -*- texinfo -*- | |
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24 ## @deftypefn {} {[@var{x}, @var{y}, @var{z}] =} sph2cart (@var{theta}, @var{phi}, @var{r}) |
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25 ## @deftypefnx {} {[@var{x}, @var{y}, @var{z}] =} sph2cart (@var{S}) |
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26 ## @deftypefnx {} {@var{C} =} sph2cart (@dots{}) |
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27 ## Transform spherical coordinates to Cartesian coordinates. |
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28 ## |
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29 ## The inputs @var{theta}, @var{phi}, and @var{r} must be the same shape, or |
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30 ## scalar. If called with a single matrix argument then each row of @var{S} |
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31 ## represents the spherical coordinate (@var{theta}, @var{phi}, @var{r}). |
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32 ## |
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33 ## @var{theta} describes the angle relative to the positive x-axis. |
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34 ## |
3803 | 35 ## @var{phi} is the angle relative to the xy-plane. |
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36 ## |
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37 ## @var{r} is the distance to the origin @w{(0, 0, 0)}. |
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38 ## |
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39 ## If only a single return argument is requested then return a matrix @var{C} |
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40 ## where each row represents one Cartesian coordinate |
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41 ## (@var{x}, @var{y}, @var{z}). |
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42 ## @seealso{cart2sph, pol2cart, cart2pol} |
3803 | 43 ## @end deftypefn |
44 | |
45 ## Author: Kai Habel <kai.habel@gmx.de> | |
46 | |
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47 function [x, y, z] = sph2cart (theta, phi, r) |
3803 | 48 |
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49 if (nargin != 1 && nargin != 3) |
6046 | 50 print_usage (); |
3803 | 51 endif |
52 | |
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53 if (nargin == 1) |
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54 if (! (isnumeric (theta) && ismatrix (theta) && columns (theta) == 3)) |
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55 error ("sph2cart: matrix input must have 3 columns [THETA, PHI, R]"); |
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56 endif |
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57 r = theta(:,3); |
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58 phi = theta(:,2); |
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59 theta = theta(:,1); |
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60 else |
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61 if (! isnumeric (theta) || ! isnumeric (phi) || ! isnumeric (r)) |
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62 error ("sph2cart: THETA, PHI, R must be numeric arrays of the same size, or scalar"); |
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63 endif |
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64 [err, theta, phi, r] = common_size (theta, phi, r); |
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65 if (err) |
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66 error ("sph2cart: THETA, PHI, R must be numeric arrays of the same size, or scalar"); |
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67 endif |
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68 endif |
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69 |
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70 x = r .* cos (phi) .* cos (theta); |
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71 y = r .* cos (phi) .* sin (theta); |
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72 z = r .* sin (phi); |
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73 |
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74 if (nargout <= 1) |
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75 x = [x(:), y(:), z(:)]; |
3803 | 76 endif |
77 | |
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78 endfunction |
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79 |
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80 |
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81 %!test |
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82 %! t = [0, 0, 0]; |
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83 %! p = [0, 0, 0]; |
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84 %! r = [0, 1, 2]; |
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85 %! [x, y, z] = sph2cart (t, p, r); |
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86 %! assert (x, r); |
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87 %! assert (y, [0, 0, 0]); |
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88 %! assert (z, [0, 0, 0]); |
3803 | 89 |
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90 %!test |
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91 %! t = 0; |
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92 %! p = [0, 0, 0]; |
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93 %! r = [0, 1, 2]; |
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94 %! C = sph2cart (t, p, r); |
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95 %! assert (C(:,1), r(:)); |
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96 %! assert (C(:,2), [0; 0; 0]); |
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97 %! assert (C(:,3), [0; 0; 0]); |
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98 |
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99 %!test |
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100 %! t = [0, 0, 0]; |
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101 %! p = 0; |
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102 %! r = [0, 1, 2]; |
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103 %! [x, y, z] = sph2cart (t, p, r); |
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104 %! assert (x, r); |
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105 %! assert (y, [0, 0, 0]); |
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106 %! assert (z, [0, 0, 0]); |
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107 |
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108 %!test |
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109 %! t = [0, 0.5, 1]*pi; |
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110 %! p = [0, 0, 0]; |
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111 %! r = 1; |
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112 %! [x, y, z] = sph2cart (t, p, r); |
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113 %! assert (x, [1, 0, -1], eps); |
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114 %! assert (y, [0, 1, 0], eps); |
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115 %! assert (z, [0, 0, 0], eps); |
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116 |
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117 %!test |
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118 %! [x, y, z] = sph2cart ([0 0 0], 0, 1); |
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119 %! assert (x, [1, 1, 1], eps); |
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120 %! assert (y, [0, 0, 0], eps); |
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121 %! assert (z, [0, 0, 0], eps); |
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122 |
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123 %!test |
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124 %! S = [ 0, 0, 1; 0.5*pi, 0, 1; pi, 0, 1]; |
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125 %! C = [ 1, 0, 0; 0, 1, 0; -1, 0, 0]; |
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126 %! assert (sph2cart (S), C, eps); |
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127 |
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128 %!test |
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129 %! [t, p, r] = meshgrid ([0, pi/2], [0, pi/2], [0, 1]); |
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130 %! [x, y, z] = sph2cart (t, p, r); |
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131 %! X = zeros(2, 2, 2); |
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132 %! X(1, 1, 2) = 1; |
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133 %! Y = zeros(2, 2, 2); |
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134 %! Y(1, 2, 2) = 1; |
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Colin Macdonald <cbm@m.fsf.org>
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135 %! Z = zeros(2, 2, 2); |
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136 %! Z(2, :, 2) = [1 1]; |
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137 %! assert (x, X, eps); |
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Colin Macdonald <cbm@m.fsf.org>
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138 %! assert (y, Y, eps); |
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Colin Macdonald <cbm@m.fsf.org>
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139 %! assert (z, Z); |
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140 |
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141 ## Test input validation |
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142 %!error sph2cart () |
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143 %!error sph2cart (1,2) |
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Colin Macdonald <cbm@m.fsf.org>
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144 %!error sph2cart (1,2,3,4) |
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Colin Macdonald <cbm@m.fsf.org>
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145 %!error <matrix input must have 3 columns> sph2cart ({1,2,3}) |
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146 %!error <matrix input must have 3 columns> sph2cart (ones (3,3,2)) |
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147 %!error <matrix input must have 3 columns> sph2cart ([1,2,3,4]) |
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148 %!error <numeric arrays of the same size> sph2cart ({1,2,3}, [1,2,3], [1,2,3]) |
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Colin Macdonald <cbm@m.fsf.org>
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149 %!error <numeric arrays of the same size> sph2cart ([1,2,3], {1,2,3}, [1,2,3]) |
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Colin Macdonald <cbm@m.fsf.org>
parents:
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150 %!error <numeric arrays of the same size> sph2cart ([1,2,3], [1,2,3], {1,2,3}) |
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Colin Macdonald <cbm@m.fsf.org>
parents:
20158
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151 %!error <numeric arrays of the same size> sph2cart (ones (3,3,3), 1, ones (3,2,3)) |
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Fix regression for coordinate transforms on 3-D arrays (partial fix bug #47036).
Colin Macdonald <cbm@m.fsf.org>
parents:
20158
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152 %!error <numeric arrays of the same size> sph2cart (ones (3,3,3), ones (3,2,3), 1) |