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1 ## Copyright (C) 2006 John W. Eaton |
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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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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} weibull_cdf (@var{x}, @var{shape}, @var{scale}) |
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21 ## Compute the cumulative distribution function (CDF) at @var{x} of the |
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22 ## Weibull distribution with shape parameter @var{scale} and scale |
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23 ## parameter @var{shape}, which is |
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24 ## |
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25 ## @example |
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26 ## 1 - exp(-(x/shape)^scale) |
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27 ## @end example |
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28 ## |
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29 ## @noindent |
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30 ## for @var{x} >= 0. |
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31 ## @end deftypefn |
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32 |
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33 function cdf = weibull_cdf (varargin) |
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34 |
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35 if (nargin == 2) |
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36 varargin{3} = varargin{2}; |
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37 varargin{2} = 1; |
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38 elseif (nargin > 2) |
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39 tmp = varargin{3}; |
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40 varargin{3} = varargin{2}; |
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41 varargin{2} = tmp; |
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42 endif |
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43 |
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44 cdf = wblcdf (varargin{:}); |
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45 |
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46 endfunction |
