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annotate scripts/elfun/acot.m @ 9665:1dba57e9d08d

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use blas_trans_type for xgemm
author Jaroslav Hajek <highegg@gmail.com>
date Sat, 26 Sep 2009 10:41:07 +0200
parents 16f53d29049f
children c776f063fefe
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16f53d29049f update copyright notices
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1 ## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2004, 2005, 2006, 2007,
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2 ## 2008, 2009 John W. Eaton
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Mapping Function} {} acot (@var{x})
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22 ## Compute the inverse cotangent in radians for each element of @var{x}.
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23 ## @seealso{cot, acotd}
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24 ## @end deftypefn
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26 ## Author: jwe
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27
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28 function w = acot (z)
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29
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30 if (nargin != 1)
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31 print_usage ();
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32 endif
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34 w = atan (1./z);
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35
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36 endfunction
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37
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38 %!test
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39 %! rt2 = sqrt (2);
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40 %! rt3 = sqrt (3);
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41 %! x = [rt3, 1, rt3/3, 0, -rt3/3, -1, -rt3];
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42 %! v = [pi/6, pi/4, pi/3, pi/2, -pi/3, -pi/4, -pi/6];
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43 %! assert(all (abs (acot (x) - v) < sqrt (eps)));
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45 %!error acot ();
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47 %!error acot (1, 2);
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