Mercurial > octave
annotate scripts/elfun/tand.m @ 29359:7854d5752dd2
maint: merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 10 Feb 2021 10:10:40 -0500 |
parents | 90fea9cc9caa 0a5b15007766 |
children | 9ed1cf9e446e 796f54d4ddbf |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 2006-2021 The Octave Project Developers |
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4 ## |
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5 ## See the file COPYRIGHT.md in the top-level directory of this |
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6 ## distribution or <https://octave.org/copyright/>. |
6239 | 7 ## |
6440 | 8 ## This file is part of Octave. |
6239 | 9 ## |
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10 ## Octave is free software: you can redistribute it and/or modify it |
6440 | 11 ## under the terms of the GNU General Public License as published by |
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12 ## the Free Software Foundation, either version 3 of the License, or |
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13 ## (at your option) any later version. |
6440 | 14 ## |
15 ## Octave is distributed in the hope that it will be useful, but | |
16 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 ## GNU General Public License for more details. |
6239 | 19 ## |
20 ## You should have received a copy of the GNU General Public License | |
7016 | 21 ## along with Octave; see the file COPYING. If not, see |
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22 ## <https://www.gnu.org/licenses/>. |
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23 ## |
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24 ######################################################################## |
6239 | 25 |
26 ## -*- texinfo -*- | |
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27 ## @deftypefn {} {} tand (@var{x}) |
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28 ## Compute the tangent for each element of @var{x} in degrees. |
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29 ## |
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30 ## Returns zero for elements where @code{@var{x}/180} is an integer and |
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31 ## @code{Inf} for elements where @code{(@var{x}-90)/180} is an integer. |
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32 ## @seealso{atand, tan} |
6239 | 33 ## @end deftypefn |
34 | |
35 function y = tand (x) | |
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36 |
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37 if (nargin < 1) |
6239 | 38 print_usage (); |
39 endif | |
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40 |
6239 | 41 I0 = x / 180; |
42 I90 = (x-90) / 180; | |
43 y = tan (I0 .* pi); | |
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44 y(I0 == fix (I0) & isfinite (I0)) = 0; |
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45 y(I90 == fix (I90) & isfinite (I90)) = Inf; |
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46 |
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47 endfunction |
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48 |
6239 | 49 |
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50 %!assert (tand (10:10:80), tan (pi*[10:10:80]/180), -10*eps) |
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51 %!assert (tand ([0, 180, 360]) == 0) |
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52 %!assert (tand ([90, 270]) == Inf) |
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53 |
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54 %!error <Invalid call> tand () |