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annotate scripts/linear-algebra/isdiag.m @ 18921:d0d0858cfab1

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doc: Match docstring variable names to function variable names for linear-algebra m-files. * isbanded.m, isdefinite.m, isdiag.m, ishermitian.m, issymmetric.m, istril.m, istriu.m: Use 'A' for input matrix in linear algebra routines. Change docstrings from 'x' to 'A'.
author Rik <rik@octave.org>
date Mon, 14 Jul 2014 08:54:45 -0700
parents 9addb5ad9426
children
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1 ## Copyright (C) 2014 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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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} isdiag (@var{A})
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21 ## Return true if @var{A} is a diagonal matrix.
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22 ## @seealso{isbanded, istril, istriu, diag, bandwidth}
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23 ## @end deftypefn
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25 ## Author: Massimiliano Fasi
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27 function retval = isdiag (A)
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29 if (nargin != 1)
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30 print_usage ();
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31 endif
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32
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33 retval = (isnumeric (A) || islogical (A)) && ndims (A) == 2;
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34 if (retval)
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35 [i, j] = find (A);
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36 retval = all (i == j);
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37 endif
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38
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39 endfunction
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42 %!assert (! isdiag ("string"))
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43 %!assert (isdiag ([]))
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44
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45 %!assert (isdiag (1))
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46 %!assert (! isdiag ([1, 1]))
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47 %!assert (! isdiag ([1; 1]))
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48 %!assert (isdiag (eye (10)))
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49 %!assert (issymmetric ([i, 0; 0, 1 + i]))
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50 %!assert (isdiag (speye (1000000)))
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51 %!assert (isdiag (logical (eye (10))))
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52
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53 %% Test input validation
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54 %!error isdiag ()
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55 %!error isdiag (1,2)
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56