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doc: Clarify description of plot format. * scripts/plot/plot.m: Clarify description of plot format.
author Rik <rik@octave.org>
date Tue, 06 Aug 2013 21:23:38 -0700
parents eaab03308c0b
children 56e72e8d1aba
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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 contour lines (isolines of constant Z value).
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25 ##
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26 ## The matrix @var{z} contains height values above the rectangular grid
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27 ## determined by @var{x} and @var{y}. If only a single input @var{z} is
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28 ## provided then @var{x} is taken to be @code{1:rows (@var{z})} and @var{y} is
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29 ## taken to be @code{1:columns (@var{z})}.
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30 ##
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31 ## The optional input @var{vn} is either a scalar denoting the number of
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32 ## contour lines to compute or a vector containing the Z values where lines
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33 ## will be computed. When @var{vn} is a vector the number of contour lines
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34 ## is @code{numel (@var{vn})}. However, to compute a single contour line
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35 ## at a given value use @code{@var{vn} = [val, val]}. If @var{vn} is omitted
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36 ## it defaults to 10.
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37 ##
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38 ## The return value @var{c} is a 2x@var{n} matrix containing the
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39 ## contour lines in the following format
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40 ##
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41 ## @example
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42 ## @group
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43 ## @var{c} = [lev1, x1, x2, @dots{}, levn, x1, x2, ...
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44 ## len1, y1, y2, @dots{}, lenn, y1, y2, @dots{}]
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45 ## @end group
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46 ## @end example
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47 ##
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48 ## @noindent
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49 ## in which contour line @var{n} has a level (height) of @var{levn} and
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50 ## length of @var{lenn}.
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51 ##
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52 ## The optional return value @var{lev} is a vector with the Z values of
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53 ## of the contour levels.
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54 ##
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55 ## Example:
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56 ##
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57 ## @example
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58 ## @group
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59 ## x = 0:2;
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60 ## y = x;
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61 ## z = x' * y;
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62 ## contourc (x, y, z, 2:3)
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63 ## @result{} 2.0000 2.0000 1.0000 3.0000 1.5000 2.0000
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64 ## 2.0000 1.0000 2.0000 2.0000 2.0000 1.5000
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65 ## @end group
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66 ## @end example
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67 ## @seealso{contour, contourf, contour3, clabel}
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68 ## @end deftypefn
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69
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70 ## Author: Shai Ayal <shaiay@users.sourceforge.net>
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71
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72 function [cout, lev] = contourc (varargin)
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73
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74 if (nargin == 1)
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75 vn = 10;
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76 z = varargin{1};
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77 [nr, nc] = size (z);
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78 x = 1:nc;
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79 y = 1:nr;
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80 elseif (nargin == 2)
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81 vn = varargin{2};
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82 z = varargin{1};
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83 [nr, nc] = size (z);
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84 x = 1:nc;
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85 y = 1:nr;
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86 elseif (nargin == 3)
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87 vn = 10;
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88 x = varargin{1};
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89 y = varargin{2};
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90 z = varargin{3};
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91 elseif (nargin == 4)
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92 vn = varargin{4};
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93 x = varargin{1};
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94 y = varargin{2};
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95 z = varargin{3};
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96 else
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97 print_usage ();
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98 endif
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99
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100 if (!ismatrix (z) || isvector (z) || isscalar (z))
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101 error ("contourc: Z argument must be a matrix");
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102 endif
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103
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104 if (isscalar (vn))
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105 vv = linspace (min (z(:)), max (z(:)), vn+2)(2:end-1);
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106 else
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107 vv = unique (sort (vn));
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108 endif
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109
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110 if (isvector (x) && isvector (y))
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111 c = __contourc__ (x(:)', y(:)', z, vv);
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112 else
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113 ## Indexes x,y for the purpose of __contourc__.
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114 ii = 1:columns (z);
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115 jj = 1:rows (z);
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116
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117 ## Now call __contourc__ for the real work...
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118 c = __contourc__ (ii, jj, z, vv);
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119
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120 ## Map the contour lines from index space (i,j) back
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121 ## to the original grid (x,y)
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122 i = 1;
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123
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124 while (i < columns (c))
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125 clen = c(2, i);
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126 ind = i + [1 : clen];
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127
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128 ci = c(1, ind);
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129 cj = c(2,ind);
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130
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131 ## due to rounding errors some elements of ci and cj
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132 ## can fall out of the range of ii and jj and interp2 would
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133 ## return NA for those values.
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134 ## The permitted range is enforced here:
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135
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136 ci = max (ci, 1); ci = min (ci, columns (z));
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137 cj = max (cj, 1); cj = min (cj, rows (z));
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138
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139 c(1, ind) = interp2 (ii, jj, x, ci, cj);
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140 c(2, ind) = interp2 (ii, jj, y, ci, cj);
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141
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142 i = i + clen + 1;
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143 endwhile
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144 endif
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145
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146 if (nargout > 0)
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147 cout = c;
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148 lev = vv;
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149 endif
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150
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151 endfunction
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152
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153
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154 %!test
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155 %! x = 0:2;
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156 %! y = x;
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157 %! z = x' * y;
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158 %! [c_actual, lev_actual]= contourc (x, y, z, 2:3);
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159 %! c_expected = [2, 1, 1, 2, 2, 3, 1.5, 2; 4, 2, 2, 1, 1, 2, 2, 1.5];
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160 %! lev_expected = [2 3];
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161 %! assert (c_actual, c_expected, eps);
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162 %! assert (lev_actual, lev_expected, eps);
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163