Mercurial > octave-nkf
annotate scripts/statistics/distributions/stdnormal_cdf.m @ 20643:d6d04088ac9e
nbininv.m: Increase speed (85X) and accuracy of function (bug #34363).
* nbininv.m: Call new function scalar_nbininv to calculate nbininv for scalar.
If there are still uncalculated values then call bin_search_nbininv. Call
bin_search_nbininv directly for vectors. Add more BIST tests.
* nbininv.m (scalar_binoinv): New subfunction to calculate nbininv for scalar x.
Stops when x > 1000.
* nbininv.m (bin_search_nbininv): New subfunction to do binary search for nbininv.
author | Lachlan Andrew <lachlanbis@gmail.com> |
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date | Sun, 11 Oct 2015 20:33:37 -0700 |
parents | d9341b422488 |
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1 ## Copyright (C) 2012 Rik Wehbring |
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2 ## Copyright (C) 1995-2015 Kurt Hornik |
3426 | 3 ## |
3922 | 4 ## This file is part of Octave. |
5 ## | |
6 ## Octave is free software; you can redistribute it and/or modify it | |
7 ## under the terms of the GNU General Public License as published by | |
7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
9 ## your option) any later version. | |
3426 | 10 ## |
3922 | 11 ## Octave is distributed in the hope that it will be useful, but |
3191 | 12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3426 | 14 ## General Public License for more details. |
15 ## | |
3191 | 16 ## You should have received a copy of the GNU General Public License |
7016 | 17 ## along with Octave; see the file COPYING. If not, see |
18 ## <http://www.gnu.org/licenses/>. | |
3191 | 19 |
3456 | 20 ## -*- texinfo -*- |
21 ## @deftypefn {Function File} {} stdnormal_cdf (@var{x}) | |
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22 ## For each element of @var{x}, compute the cumulative distribution function |
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23 ## (CDF) at @var{x} of the standard normal distribution |
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24 ## (mean = 0, standard deviation = 1). |
3456 | 25 ## @end deftypefn |
3191 | 26 |
5428 | 27 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
3456 | 28 ## Description: CDF of the standard normal distribution |
3191 | 29 |
30 function cdf = stdnormal_cdf (x) | |
3426 | 31 |
3191 | 32 if (nargin != 1) |
6046 | 33 print_usage (); |
3191 | 34 endif |
35 | |
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36 if (iscomplex (x)) |
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37 error ("stdnormal_cdf: X must not be complex"); |
3191 | 38 endif |
39 | |
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40 cdf = erfc (x / (-sqrt(2))) / 2; |
3426 | 41 |
3191 | 42 endfunction |
43 | |
44 | |
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45 %!shared x,y |
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46 %! x = [-Inf 0 1 Inf]; |
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47 %! y = [0, 0.5, 1/2*(1+erf(1/sqrt(2))), 1]; |
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48 %!assert (stdnormal_cdf ([x, NaN]), [y, NaN]) |
3191 | 49 |
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50 ## Test class of input preserved |
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51 %!assert (stdnormal_cdf (single ([x, NaN])), single ([y, NaN]), eps ("single")) |
3426 | 52 |
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53 ## Test input validation |
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54 %!error stdnormal_cdf () |
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55 %!error stdnormal_cdf (1,2) |
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56 %!error stdnormal_cdf (i) |
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57 |