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doc: Improve documentation for 2-D plot functions * doc/interpreter/plot.txi: Rewrite documentation around get/set. * libinterp/interpfcn/graphics.cc(Fget, Fset): Add seealso links. Add additional calling forms for get(). * scripts/plot/bar.m, scripts/plot/barh.m, scripts/plot/comet.m, scripts/plot/comet3.m, scripts/plot/contour.m, scripts/plot/contour3.m, scripts/plot/contourc.m, scripts/plot/contourf.m, scripts/plot/errorbar.m, scripts/plot/gca.m, scripts/plot/gcf.m, scripts/plot/gco.m, scripts/plot/ishghandle.m, scripts/plot/loglogerr.m, scripts/plot/pareto.m, scripts/plot/pcolor.m, scripts/plot/pie.m, scripts/plot/pie3.m, scripts/plot/plotmatrix.m, scripts/plot/plotyy.m, scripts/plot/polar.m, scripts/plot/quiver.m, scripts/plot/quiver3.m, scripts/plot/rose.m, scripts/plot/scatter.m, scripts/plot/semilogxerr.m, scripts/plot/semilogyerr.m, scripts/plot/sombrero.m, scripts/plot/stairs.m, scripts/plot/stem.m, scripts/plot/stem3.m: Improve docstrings.
author Rik <rik@octave.org>
date Sat, 22 Jun 2013 17:40:52 -0700
parents c2dbdeaa25df
children eaab03308c0b
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1 ## Copyright (C) 2003-2012 Shai Ayal
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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} {[@var{c}, @var{lev}] =} contourc (@var{z})
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21 ## @deftypefnx {Function File} {[@var{c}, @var{lev}] =} contourc (@var{z}, @var{vn})
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22 ## @deftypefnx {Function File} {[@var{c}, @var{lev}] =} contourc (@var{x}, @var{y}, @var{z})
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23 ## @deftypefnx {Function File} {[@var{c}, @var{lev}] =} contourc (@var{x}, @var{y}, @var{z}, @var{vn})
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24 ## Compute isolines (contour lines) of the matrix @var{z}.
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25 ## Parameters @var{x}, @var{y}, and @var{vn} are optional.
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26 ##
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27 ## The return value @var{lev} is a vector of the contour levels.
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28 ## The return value @var{c} is a 2x@var{n} matrix containing the
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29 ## contour lines in the following format
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30 ##
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31 ## @example
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32 ## @group
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33 ## @var{c} = [lev1, x1, x2, @dots{}, levn, x1, x2, ...
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34 ## len1, y1, y2, @dots{}, lenn, y1, y2, @dots{}]
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35 ## @end group
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36 ## @end example
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37 ##
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38 ## @noindent
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39 ## in which contour line @var{n} has a level (height) of @var{levn} and
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40 ## length of @var{lenn}.
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41 ##
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42 ## If @var{x} and @var{y} are omitted they are taken as the row/column
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43 ## indices of @var{z}. @var{vn} is either a scalar denoting the number of
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44 ## contour lines to compute or a vector containing the values of the lines.
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45 ## If only one value is desired, set @code{@var{vn} = [val, val]};
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46 ## If @var{vn} is omitted it defaults to 10.
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47 ##
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48 ## For example:
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49 ##
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50 ## @example
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51 ## @group
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52 ## x = 0:2;
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53 ## y = x;
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54 ## z = x' * y;
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55 ## contourc (x, y, z, 2:3)
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56 ## @result{} 2.0000 2.0000 1.0000 3.0000 1.5000 2.0000
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57 ## 2.0000 1.0000 2.0000 2.0000 2.0000 1.5000
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58 ## @end group
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59 ## @end example
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60 ## @seealso{contour, contourf, contour3}
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61 ## @end deftypefn
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62
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63 ## Author: Shai Ayal <shaiay@users.sourceforge.net>
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64
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65 function [cout, lev] = contourc (varargin)
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66
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67 if (nargin == 1)
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68 vn = 10;
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69 z = varargin{1};
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70 [nr, nc] = size (z);
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71 x = 1:nc;
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72 y = 1:nr;
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73 elseif (nargin == 2)
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74 vn = varargin{2};
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75 z = varargin{1};
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76 [nr, nc] = size (z);
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77 x = 1:nc;
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78 y = 1:nr;
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79 elseif (nargin == 3)
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80 vn = 10;
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81 x = varargin{1};
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82 y = varargin{2};
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83 z = varargin{3};
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84 elseif (nargin == 4)
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85 vn = varargin{4};
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86 x = varargin{1};
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87 y = varargin{2};
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88 z = varargin{3};
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89 else
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90 print_usage ();
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91 endif
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92
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93 if (!ismatrix (z) || isvector (z) || isscalar (z))
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94 error ("contourc: Z argument must be a matrix");
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95 endif
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96
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97 if (isscalar (vn))
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98 vv = linspace (min (z(:)), max (z(:)), vn+2)(2:end-1);
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99 else
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100 vv = unique (sort (vn));
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101 endif
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102
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103 if (isvector (x) && isvector (y))
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104 c = __contourc__ (x(:)', y(:)', z, vv);
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105 else
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106 ## Indexes x,y for the purpose of __contourc__.
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107 ii = 1:columns (z);
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108 jj = 1:rows (z);
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109
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110 ## Now call __contourc__ for the real work...
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111 c = __contourc__ (ii, jj, z, vv);
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112
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113 ## Map the contour lines from index space (i,j) back
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114 ## to the original grid (x,y)
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115 i = 1;
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116
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117 while (i < columns (c))
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118 clen = c(2, i);
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119 ind = i + [1 : clen];
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120
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121 ci = c(1, ind);
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122 cj = c(2,ind);
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123
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124 ## due to rounding errors some elements of ci and cj
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125 ## can fall out of the range of ii and jj and interp2 would
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126 ## return NA for those values.
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127 ## The permitted range is enforced here:
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128
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129 ci = max (ci, 1); ci = min (ci, columns (z));
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130 cj = max (cj, 1); cj = min (cj, rows (z));
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131
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132 c(1, ind) = interp2 (ii, jj, x, ci, cj);
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133 c(2, ind) = interp2 (ii, jj, y, ci, cj);
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134
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135 i = i + clen + 1;
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136 endwhile
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137 endif
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138
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David Bateman <dbateman@free.fr>
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139 if (nargout > 0)
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David Bateman <dbateman@free.fr>
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140 cout = c;
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141 lev = vv;
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142 endif
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143
44c91c5dfe1d [project @ 2007-01-30 19:16:52 by jwe]
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144 endfunction
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145
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Rik <octave@nomad.inbox5.com>
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146
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147 %!test
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148 %! x = 0:2;
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149 %! y = x;
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150 %! z = x' * y;
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151 %! [c_actual, lev_actual]= contourc (x, y, z, 2:3);
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152 %! c_expected = [2, 1, 1, 2, 2, 3, 1.5, 2; 4, 2, 2, 1, 1, 2, 2, 1.5];
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153 %! lev_expected = [2 3];
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154 %! assert (c_actual, c_expected, eps);
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155 %! assert (lev_actual, lev_expected, eps);
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156