Mercurial > octave
annotate scripts/statistics/base/studentize.m @ 11149:fe3c3dfc07eb
style fix: break lines before && and ||, not after
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Sat, 23 Oct 2010 03:00:31 -0400 |
| parents | cab3b148d4e4 |
| children | e151e23f73bc |
| rev | line source |
|---|---|
| 7017 | 1 ## Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2004, 2005, |
| 9245 | 2 ## 2006, 2007, 2009 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 |
| 3200 | 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 ## | |
| 3200 | 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/>. | |
| 3200 | 19 |
| 3453 | 20 ## -*- texinfo -*- |
| 4885 | 21 ## @deftypefn {Function File} {} studentize (@var{x}, @var{dim}) |
| 3453 | 22 ## If @var{x} is a vector, subtract its mean and divide by its standard |
| 3200 | 23 ## deviation. |
| 24 ## | |
| 4885 | 25 ## If @var{x} is a matrix, do the above along the first non-singleton |
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26 ## dimension. If the optional argument @var{dim} is given then operate |
| 4885 | 27 ## along this dimension. |
| 3453 | 28 ## @end deftypefn |
| 3200 | 29 |
| 5428 | 30 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 3456 | 31 ## Description: Subtract mean and divide by standard deviation |
| 3200 | 32 |
| 4885 | 33 function t = studentize (x, dim) |
| 3426 | 34 |
| 4885 | 35 if (nargin != 1 && nargin != 2) |
| 6046 | 36 print_usage (); |
| 3200 | 37 endif |
| 38 | |
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39 if (!ismatrix(x) || ischar(x)) |
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cab3b148d4e4
Improve validation of input arguments for base statistics functions.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
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40 error ("studentize: X must be a numeric matrix or vector"); |
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cab3b148d4e4
Improve validation of input arguments for base statistics functions.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
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41 endif |
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cab3b148d4e4
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Rik <octave@nomad.inbox5.com>
parents:
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42 |
| 4885 | 43 nd = ndims (x); |
| 44 sz = size (x); | |
| 45 if (nargin != 2) | |
| 4886 | 46 ## Find the first non-singleton dimension. |
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10669
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Improve validation of input arguments for base statistics functions.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
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47 dim = find (sz > 1, 1); |
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cab3b148d4e4
Improve validation of input arguments for base statistics functions.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
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48 if (isempty (dim)) |
| 4885 | 49 dim = 1; |
| 3200 | 50 endif |
| 51 else | |
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11149
fe3c3dfc07eb
style fix: break lines before && and ||, not after
John W. Eaton <jwe@octave.org>
parents:
10669
diff
changeset
|
52 if (!(isscalar (dim) && dim == round (dim)) |
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fe3c3dfc07eb
style fix: break lines before && and ||, not after
John W. Eaton <jwe@octave.org>
parents:
10669
diff
changeset
|
53 || !(1 <= dim && dim <= nd)) |
|
10669
cab3b148d4e4
Improve validation of input arguments for base statistics functions.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
|
54 error ("studentize: DIM must be an integer and a valid dimension"); |
| 4885 | 55 endif |
| 56 endif | |
| 57 | |
| 4886 | 58 c = sz(dim); |
| 4885 | 59 idx = ones (1, nd); |
| 4886 | 60 idx(dim) = c; |
| 4885 | 61 t = x - repmat (mean (x, dim), idx); |
| 62 t = t ./ repmat (max (cat (dim, std(t, [], dim), ! any (t, dim)), [], dim), idx); | |
| 63 | |
| 64 endfunction |