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annotate scripts/elfun/tand.m @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents 7503499a252b
children
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 2006-2015 David Bateman
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} tand (@var{x})
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21 ## Compute the tangent for each element of @var{x} in degrees.
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22 ##
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23 ## Returns zero for elements where @code{@var{x}/180} is an integer and
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24 ## @code{Inf} for elements where @code{(@var{x}-90)/180} is an integer.
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25 ## @seealso{atand, tan}
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26 ## @end deftypefn
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27
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28 ## Author: David Bateman <dbateman@free.fr>
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30 function y = tand (x)
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32 if (nargin != 1)
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33 print_usage ();
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34 endif
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35
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36 I0 = x / 180;
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37 I90 = (x-90) / 180;
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38 y = tan (I0 .* pi);
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39 y(I0 == fix (I0) & isfinite (I0)) = 0;
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40 y(I90 == fix (I90) & isfinite (I90)) = Inf;
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42 endfunction
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45 %!assert (tand (10:10:80), tan (pi*[10:10:80]/180), -10*eps)
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46 %!assert (tand ([0, 180, 360]) == 0)
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47 %!assert (tand ([90, 270]) == Inf)
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49 %!error tand ()
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50 %!error tand (1, 2)
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