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annotate scripts/plot/stairs.m @ 7935:85d6296d51e1

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Add gcbo/gcbf functions.
author John W. Eaton <jwe@octave.org>
date Wed, 16 Jul 2008 14:28:48 -0400
parents 95dce69538ec
children 9a6f4713f765
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1 ## Copyright (C) 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2004,
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2 ## 2005, 2006, 2007 John W. Eaton
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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} {} stairs (@var{x}, @var{y})
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22 ## @deftypefnx {Function File} {} stairs (@dots{}, @var{style})
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23 ## @deftypefnx {Function File} {} stairs (@dots{}, @var{prop}, @var{val})
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24 ## @deftypefnx {Function File} {} stairs (@var{h}, @dots{})
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25 ## @deftypefnx {Function File} {@var{h} =} stairs (@dots{})
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26 ## Produce a stairstep plot. The arguments may be vectors or matrices.
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27 ##
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28 ## If only one argument is given, it is taken as a vector of y-values
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29 ## and the x coordinates are taken to be the indices of the elements.
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30 ##
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31 ## If two output arguments are specified, the data are generated but
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32 ## not plotted. For example,
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33 ##
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34 ## @example
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35 ## stairs (x, y);
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36 ## @end example
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37 ##
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38 ## @noindent
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39 ## and
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40 ##
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41 ## @example
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42 ## @group
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43 ## [xs, ys] = stairs (x, y);
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44 ## plot (xs, ys);
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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 ## are equivalent.
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50 ## @seealso{plot, semilogx, semilogy, loglog, polar, mesh, contour,
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51 ## bar, xlabel, ylabel, title}
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52 ## @end deftypefn
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53
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54 ## Author: jwe
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55
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56 function [xs, ys] = stairs (varargin)
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57
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58 [ax, varargin, nargin] = __plt_get_axis_arg__ ("stairs", varargin{:});
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59
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60 if (nargin < 1)
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61 print_usage ();
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62 else
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63 if (nargout > 1)
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64 [h, xs, ys] = __stairs__ (false, varargin{:});
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65 else
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66 oldax = gca ();
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67 unwind_protect
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68 axes (ax);
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69 newplot ();
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70 [h, xxs, yys] = __stairs__ (true, varargin{:});
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71 unwind_protect_cleanup
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72 axes (oldax);
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73 end_unwind_protect
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74 endif
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75 if (nargout == 1)
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76 xs = h;
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77 endif
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78 endif
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79 endfunction
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80
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81 function [h, xs, ys] = __stairs__ (doplot, varargin)
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82
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83 if (nargin == 1 || ischar (varargin{2}))
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84 idx = 1;
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85 y = varargin {1};
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86 if (ismatrix (y))
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87 if (isvector (y))
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88 y = y(:);
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89 endif
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90 x = 1:rows (y);
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91 endif
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92 else
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93 idx = 2;
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94 x = varargin{1};
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95 y = varargin{2};
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96 endif
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97
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98 if (ndims (x) > 2 || ndims (y) > 2)
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99 error ("stairs: expecting 2-d arguments");
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100 endif
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101
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102 vec_x = isvector (x);
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103
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104 if (vec_x)
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105 x = x(:);
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106 endif
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107
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108 if (isvector (y))
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109 y = y(:);
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110 endif
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111
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112 if (ismatrix (y))
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113 [nr, nc] = size (y);
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114 if (vec_x)
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115 x = repmat (x, [1, nc]);
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116 else
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117 [x_nr, x_nc] = size (x);
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118 if (x_nr != nr || x_nc != nc)
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119 error ("stairs: argument size mismatch");
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120 endif
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121 endif
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122 endif
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123
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124 len = 2*nr - 1;
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125
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126 xs = ys = zeros (len, nc);
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127
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128 xs(1,:) = x(1,:);
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129 ys(1,:) = y(1,:);
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130
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131 x = x(2:nr,:);
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132 ridx = 2:2:len-1;
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133 xs(ridx,:) = x;
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134 ys(ridx,:) = y(1:nr-1,:);
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135
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136 ridx = 3:2:len;
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137 xs(ridx,:) = x;
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138 ys(ridx,:) = y(2:nr,:);
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139
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140 if (doplot)
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141 h = plot (xs, ys, varargin{idx+1:end});
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142 else
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143 h = 0;
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144 endif
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145
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146 endfunction
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147
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148 %!demo
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149 %! x = 1:10;
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150 %! y = rand (1, 10);
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151 ## stairs (x, y);
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152
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153 %!demo
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154 %! x = 1:10;
d65670971cbc [project @ 2007-12-04 03:03:54 by jwe]
jwe
parents: 7017
diff changeset
155 %! y = rand (1, 10);
d65670971cbc [project @ 2007-12-04 03:03:54 by jwe]
jwe
parents: 7017
diff changeset
156 %! [xs, ys] = stairs (x, y);
d65670971cbc [project @ 2007-12-04 03:03:54 by jwe]
jwe
parents: 7017
diff changeset
157 %! plot (xs, ys);