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[project @ 2006-03-06 21:26:48 by jwe]
author jwe
date Mon, 06 Mar 2006 21:26:54 +0000
parents 4c8a2e4e0717
children 34f96dd5441b
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1 ## Copyright (C) 1995, 1996 Kurt Hornik
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Mapping Function} {} pow2 (@var{x})
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22 ## @deftypefnx {Mapping Function} {} pow2 (@var{f}, @var{e})
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23 ## With one argument, computes
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24 ## @iftex
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25 ## @tex
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26 ## $2^x$
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27 ## @end tex
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28 ## @end iftex
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29 ## @ifinfo
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30 ## 2 .^ x
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31 ## @end ifinfo
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32 ## for each element of @var{x}. With two arguments, returns
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33 ## @iftex
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34 ## @tex
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35 ## $f \cdot 2^e$.
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36 ## @end tex
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37 ## @end iftex
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38 ## @ifinfo
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39 ## f .* (2 .^ e).
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40 ## @end ifinfo
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41 ## @seealso{nextpow2}
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42 ## @end deftypefn
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44 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
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45 ## Created: 17 October 1994
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46 ## Adapted-By: jwe
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47
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48 function y = pow2 (f, e)
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49
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50 if (nargin == 1)
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51 y = 2 .^ f;
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52 elseif (nargin == 2)
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53 y = f .* (2 .^ e);
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54 else
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55 usage ("y = pow2 (f, e)");
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56 endif
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57
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58 endfunction