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annotate scripts/plot/hold.m @ 17453:2fee3022ac2f

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compass.m: Overhaul function. * scripts/plot/compass.m: Reduce arrowhead to 20% of body length. Recode input validation to be simpler.
author Rik <rik@octave.org>
date Thu, 19 Sep 2013 13:48:54 -0700
parents bc924baa2c4e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2005-2012 John W. Eaton
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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 {Command} {} hold
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21 ## @deftypefnx {Command} {} hold on
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22 ## @deftypefnx {Command} {} hold off
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23 ## @deftypefnx {Command} {} hold all
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24 ## @deftypefnx {Function File} {} hold (@var{hax}, @dots{})
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25 ## Toggle or set the @qcode{"hold"} state of the plotting engine which
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26 ## determines whether new graphic objects are added to the plot or replace
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27 ## the existing objects.
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28 ##
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29 ## @table @code
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30 ## @item hold on
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31 ## Retain plot data and settings so that subsequent plot commands are displayed
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32 ## on a single graph.
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33 ##
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34 ## @item hold all
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35 ## Retain plot line color, line style, data, and settings so that subsequent
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36 ## plot commands are displayed on a single graph with the next line color and
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37 ## style.
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38 ##
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39 ## @item hold off
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40 ## Restore default graphics settings which clear the graph and reset axis
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41 ## properties before each new plot command. (default).
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42 ##
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43 ## @item hold
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44 ## Toggle the current hold state.
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45 ## @end table
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46 ##
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47 ## When given the additional argument @var{hax}, the hold state is modified
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48 ## for this axis rather than the current axes returned by @code{gca}.
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49 ##
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50 ## To query the current hold state use the @code{ishold} function.
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51 ## @seealso{ishold, cla, clf, newplot}
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52 ## @end deftypefn
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53
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54 function hold (varargin)
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55
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56 if (nargin > 0 && isscalar (varargin{1}) && isaxes (varargin{1}))
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57 hax = varargin{1};
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58 varargin(1) = [];
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59 nargs = numel (varargin);
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60 ## FIXME: Should this be ancestor (hax, "parent")?
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61 hfig = get (hax, "parent");
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62 elseif (nargin > 0 && numel (varargin{1}) > 1 && ishandle (varargin{1}))
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63 print_usage ();
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64 else
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65 hax = gca ();
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66 hfig = gcf ();
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67 nargs = numel (varargin);
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68 endif
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69
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70 hold_all = false;
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71 if (nargs == 0)
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72 turn_hold_off = ishold (hax);
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73 elseif (nargs == 1)
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74 state = tolower (varargin{1});
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75 switch (state)
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76 case "off"
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77 turn_hold_off = true;
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78 case "all"
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79 turn_hold_off = false;
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80 hold_all = true;
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81 case "on"
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82 turn_hold_off = false;
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83 otherwise
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84 error ("hold: invalid hold STATE");
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85 endswitch
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86 else
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87 print_usage ();
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88 endif
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89
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90 if (turn_hold_off)
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91 set (hax, "nextplot", "replace");
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92 else
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93 set (hax, "nextplot", "add");
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94 set (hfig, "nextplot", "add");
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95 endif
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96 set (hax, "__hold_all__", hold_all);
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97
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98 endfunction
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99
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101 %!demo
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102 %! clf;
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103 %! t = linspace (0, 2*pi, 100);
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104 %! plot (t, sin (t));
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105 %! hold on;
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106 %! plot (t, cos (t));
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107 %! title ({'hold on', '2 plots shown on same graph'});
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108 %! hold off;
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109
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110 %!demo
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111 %! clf;
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112 %! t = linspace (0, 2*pi, 100);
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113 %! plot (t, sin (t));
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114 %! hold all;
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115 %! plot (t, cos (t));
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116 %! title ({'hold all', '2 plots shown on same graph with linestyle also preserved'});
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117 %! hold off;
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118
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119 %!demo
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120 %! clf;
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121 %! A = rand (100);
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122 %! [X, Y] = find (A > 0.95);
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123 %! imshow (A);
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124 %! hold on;
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125 %! plot (X, Y, 'o');
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126 %! hold off;
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127 %! title ('hold with image and plot');
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128
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129 %!demo
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130 %! clf;
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131 %! colormap ('default');
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132 %! hold on;
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133 %! imagesc (1 ./ hilb (4));
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134 %! plot (1:4, '-s');
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135 %! hold off;
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136
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137 %!demo
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138 %! clf;
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139 %! colormap ('default');
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140 %! hold on;
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141 %! imagesc (1 ./ hilb (2));
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142 %! imagesc (1 ./ hilb (4));
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143 %! hold off;
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144
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145 %!demo
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146 %! clf;
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147 %! colormap ('default');
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148 %! hold on;
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149 %! plot (1:4, '-s');
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150 %! imagesc (1 ./ hilb (4));
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151 %! hold off;
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152
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153 %!demo
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154 %! clf;
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155 %! colormap ('default');
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156 %! t = linspace (-3, 3, 50);
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157 %! [x, y] = meshgrid (t, t);
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158 %! z = peaks (x, y);
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159 %! contourf (x, y, z, 10);
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160 %! hold on;
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161 %! plot (x(:), y(:), '^');
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162 %! patch ([-1.0 1.0 1.0 -1.0 -1.0], [-1.0 -1.0 1.0 1.0 -1.0], 'red');
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163 %! xlim ([-2.0 2.0]);
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164 %! ylim ([-2.0 2.0]);
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165 %! colorbar ('SouthOutside');
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166 %! title ('Test script for some plot functions');
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167
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168 ## hold on test
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169 %!test
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170 %! hf = figure ("visible", "off");
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171 %! unwind_protect
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172 %! p = plot ([0 1]);
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173 %! assert (! ishold);
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174 %! hold on;
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175 %! assert (ishold);
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176 %! p1 = fill ([0 1 1], [0 0 1], "black");
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177 %! p2 = fill ([0 1 0], [0 1 1], "red");
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178 %! assert (length (get (hf, "children")), 1);
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179 %! assert (length (get (gca, "children")), 3);
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180 %! unwind_protect_cleanup
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181 %! close (hf);
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182 %! end_unwind_protect
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183
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184 ## hold off test
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185 %!test
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186 %! hf = figure ("visible", "off");
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187 %! unwind_protect
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188 %! p = plot ([0 1]);
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189 %! assert (! ishold);
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190 %! hold on;
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191 %! assert (ishold);
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192 %! p1 = fill ([0 1 1], [0 0 1], "black");
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193 %! hold off;
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194 %! p2 = fill ([0 1 0], [0 1 1], "red");
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195 %! assert (length (get (hf, "children")), 1);
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196 %! assert (length (get (gca, "children")), 1);
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197 %! unwind_protect_cleanup
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198 %! close (hf);
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199 %! end_unwind_protect
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200