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annotate scripts/plot/contourf.m @ 14872:c2dbdeaa25df

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maint: use rows() and columns() to clarify m-files. * gradient.m, interp1q.m, rat.m, tsearchn.m, image.m, imwrite.m, area.m, contourc.m, hist.m, isocolors.m, isonormals.m, meshz.m, print.m, __bar__.m, __go_draw_axes__.m, __interp_cube__.m, __marching_cube__.m, __patch__.m, __print_parse_opts__.m, __quiver__.m, rose.m, shrinkfaces.m, stairs.m, surfnorm.m, tetramesh.m, text.m, deconv.m, spline.m, intersect.m, setdiff.m, setxor.m, union.m, periodogram.m, pcg.m, perms.m: Replace size (x,1) with rows (x) and size(x,2) with columns(x).
author Rik <octave@nomad.inbox5.com>
date Tue, 17 Jul 2012 13:34:19 -0700
parents c4fa5e0b6193
children 64e7bb01fce2
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2007-2012 Kai Habel
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2 ## Copyright (C) 2003 Shai Ayal
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {[@var{c}, @var{h}] =} contourf (@var{x}, @var{y}, @var{z}, @var{lvl})
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22 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@var{x}, @var{y}, @var{z}, @var{n})
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23 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@var{x}, @var{y}, @var{z})
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24 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@var{z}, @var{n})
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25 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@var{z}, @var{lvl})
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26 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@var{z})
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27 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@var{ax}, @dots{})
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28 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@dots{}, @var{"property"}, @var{val})
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29 ## Compute and plot filled contours of the matrix @var{z}.
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30 ## Parameters @var{x}, @var{y} and @var{n} or @var{lvl} are optional.
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31 ##
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32 ## The return value @var{c} is a 2xn matrix containing the contour lines
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33 ## as described in the help to the contourc function.
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34 ##
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35 ## The return value @var{h} is handle-vector to the patch objects creating
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36 ## the filled contours.
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37 ##
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38 ## If @var{x} and @var{y} are omitted they are taken as the row/column
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39 ## index of @var{z}. @var{n} is a scalar denoting the number of lines
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40 ## to compute. Alternatively @var{lvl} is a vector containing the
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41 ## contour levels. If only one value (e.g., lvl0) is wanted, set
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42 ## @var{lvl} to [lvl0, lvl0]. If both @var{n} or @var{lvl} are omitted
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43 ## a default value of 10 contour level is assumed.
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44 ##
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45 ## If provided, the filled contours are added to the axes object
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46 ## @var{ax} instead of the current axis.
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47 ##
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48 ## The following example plots filled contours of the @code{peaks}
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49 ## function.
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50 ##
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51 ## @example
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52 ## @group
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53 ## [x, y, z] = peaks (50);
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54 ## contourf (x, y, z, -7:9)
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55 ## @end group
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56 ## @end example
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57 ## @seealso{contour, contourc, patch}
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58 ## @end deftypefn
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59
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60 ## Author: Kai Habel <kai.habel@gmx.de>
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61 ## Author: Shai Ayal <shaiay@users.sourceforge.net>
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62
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63 function [c, h] = contourf (varargin)
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64
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65 [xh, varargin] = __plt_get_axis_arg__ ("contour", varargin{:});
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66
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67 oldh = gca ();
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68 unwind_protect
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69 axes (xh);
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70 newplot ();
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71 [ctmp, htmp] = __contour__ (xh, "none", "fill", "on",
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72 "linecolor", "black", varargin{:});
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73 unwind_protect_cleanup
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74 axes (oldh);
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75 end_unwind_protect
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76
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77 if (nargout > 0)
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78 c = ctmp;
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79 h = htmp;
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80 endif
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81
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82 endfunction
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83
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84
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85 %!demo
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86 %! clf;
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87 %! colormap ('default');
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88 %! [x, y, z] = peaks (50);
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89 %! contourf (x, y, z, -7:9);
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90
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91 %!demo
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92 %! clf;
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93 %! colormap ('default');
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94 %! [theta, r] = meshgrid (linspace (0,2*pi,64), linspace (0,1,64));
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95 %! [X, Y] = pol2cart (theta, r);
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96 %! Z = sin (2*theta) .* (1-r);
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97 %! contourf (X, Y, abs (Z), 10);
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98