Mercurial > octave-antonio
annotate scripts/linear-algebra/istril.m @ 19833:9fc020886ae9
maint: Clean up m-files to follow Octave coding conventions.
Try to trim long lines to < 80 chars.
Use '##' for single line comments.
Use '(...)' around tests for if/elseif/switch/while.
Abut cell indexing operator '{' next to variable.
Abut array indexing operator '(' next to variable.
Use space between negation operator '!' and following expression.
Use two newlines between endfunction and start of %!test or %!demo code.
Remove unnecessary parens grouping between short-circuit operators.
Remove stray extra spaces (typos) between variables and assignment operators.
Remove stray extra spaces from ends of lines.
author | Rik <rik@octave.org> |
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date | Mon, 23 Feb 2015 14:54:39 -0800 |
parents | 4197fc428c7d |
children | 03b9d17a2d95 |
rev | line source |
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maint: Update copyright notices for 2015.
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2014-2015 Massimiliano Fasi |
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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} {} istril (@var{A}) |
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21 ## Return true if @var{A} is a lower triangular matrix. |
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22 ## |
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23 ## A lower triangular matrix has nonzero entries only on the main diagonal |
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24 ## and below. |
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25 ## @seealso{istriu, isbanded, isdiag, tril, bandwidth} |
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26 ## @end deftypefn |
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27 |
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28 ## Author: Massimiliano Fasi |
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29 |
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30 function retval = istril (A) |
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31 |
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32 if (nargin != 1) |
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33 print_usage (); |
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34 endif |
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35 |
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36 retval = (isnumeric (A) || islogical (A)) && ndims (A) == 2; |
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37 if (retval) |
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38 [i, j] = find (A); |
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39 retval = all (i >= j); |
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40 endif |
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41 |
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42 endfunction |
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43 |
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44 |
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45 %!assert (! istril ("string")) |
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46 %!assert (istril ([])) |
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47 %!assert (! istril (zeros (2,2,2))) |
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48 |
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49 %!assert (istril (1)) |
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50 %!assert (! istril ([1, 1])) |
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51 %!assert (istril ([1; 1])) |
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52 %!assert (istril (eye (10))) |
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53 %!assert (istril (speye (100))) |
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54 |
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55 %!assert (istril (tril (randn (10)))) |
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56 %!assert (! istril (randn (10))) |
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57 |
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58 ## Test input validation |
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59 %!error istril () |
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60 %!error istril (1,2) |
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61 |