Mercurial > hg > octave-lyh
annotate scripts/sparse/spy.m @ 17194:c954b0a396a2
comet.m: Speed up animation by using low-level graphic commands.
* scripts/plot/comet.m: Speed up animation by using low-level graphic
commands.
| author | Rik <rik@octave.org> |
|---|---|
| date | Mon, 05 Aug 2013 15:44:02 -0700 |
| parents | f3d52523cde1 |
| children |
| rev | line source |
|---|---|
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maint: update copyright notices for 2012
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1 ## Copyright (C) 1998-2012 Andy Adler |
| 7016 | 2 ## |
| 3 ## This file is part of Octave. | |
| 5164 | 4 ## |
| 7016 | 5 ## Octave is free software; you can redistribute it and/or modify it |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 5164 | 9 ## |
| 7016 | 10 ## Octave is distributed in the hope that it will be useful, but |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 5164 | 14 ## |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 5164 | 18 |
| 19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {} spy (@var{x}) |
| 6607 | 21 ## @deftypefnx {Function File} {} spy (@dots{}, @var{markersize}) |
| 8507 | 22 ## @deftypefnx {Function File} {} spy (@dots{}, @var{line_spec}) |
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23 ## Plot the sparsity pattern of the sparse matrix @var{x}. If the argument |
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24 ## @var{markersize} is given as a scalar value, it is used to determine the |
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25 ## point size in the plot. If the string @var{line_spec} is given it is |
| 6607 | 26 ## passed to @code{plot} and determines the appearance of the plot. |
| 27 ## @seealso{plot} | |
| 5164 | 28 ## @end deftypefn |
| 29 | |
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30 function spy (x, varargin) |
| 6607 | 31 |
| 7125 | 32 if (nargin < 1) |
| 33 print_usage (); | |
| 34 endif | |
| 35 | |
| 6607 | 36 markersize = NaN; |
| 10714 | 37 if (numel (x) < 1000) |
| 8507 | 38 line_spec = "*"; |
| 6607 | 39 else |
| 8507 | 40 line_spec = "."; |
| 6607 | 41 endif |
| 8507 | 42 for i = 1:length (varargin) |
| 43 if (ischar (varargin{i})) | |
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44 if (length (varargin{i}) == 1) |
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45 line_spec = [line_spec, varargin{i}]; |
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46 else |
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47 line_spec = varargin{i}; |
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48 endif |
| 6607 | 49 elseif (isscalar (varargin{i})) |
| 50 markersize = varargin{i}; | |
| 51 else | |
| 52 error ("spy: expected markersize or linespec"); | |
| 53 endif | |
| 54 endfor | |
| 6446 | 55 |
| 8507 | 56 [i, j, s] = find (x); |
| 57 [m, n] = size (x); | |
| 5164 | 58 |
| 6607 | 59 if (isnan (markersize)) |
| 8507 | 60 plot (j, i, line_spec); |
| 6446 | 61 else |
| 8507 | 62 plot (j, i, line_spec, "markersize", markersize); |
| 6446 | 63 endif |
| 5164 | 64 |
| 6674 | 65 axis ([0, n+1, 0, m+1], "ij"); |
| 5164 | 66 |
| 67 endfunction | |
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68 |
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69 |
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70 %!demo |
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71 %! clf; |
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72 %! spy (sprand (10,10, 0.2)); |
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73 |
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74 %% Mark graphical function as tested by demo block |
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75 %!assert (1) |
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76 |