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annotate scripts/plot/stem.m @ 8070:3b53b25e2550

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Add data sources and line series
author David Bateman <dbateman@free.fr>
date Thu, 28 Aug 2008 12:23:54 -0400
parents 961d4c52ffae
children eb63fbe60fab
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1 ## Copyright (C) 2006, 2007 Michel D. Schmid
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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{h} =} stem (@var{x}, @var{y}, @var{linespec})
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21 ## @deftypefnx {Function File} {@var{h} =} stem (@dots{}, "filled")
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22 ## Plot a stem graph from two vectors of x-y data. If only one argument
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23 ## is given, it is taken as the y-values and the x coordinates are taken
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24 ## from the indicies of the elements.
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25 ##
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26 ## If @var{y} is a matrix, then each column of the matrix is plotted as
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27 ## a separate stem graph. In this case @var{x} can either be a vector,
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28 ## the same length as the number of rows in @var{y}, or it can be a
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29 ## matrix of the same size as @var{y}.
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30 ##
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31 ## The default color is @code{"r"} (red). The default line style is
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32 ## @code{"-"} and the default marker is @code{"o"}. The line style can
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33 ## be altered by the @code{linespec} argument in the same manner as the
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34 ## @code{plot} command. For example
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35 ##
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36 ## @example
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37 ## @group
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38 ## x = 1:10;
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39 ## y = ones (1, length (x))*2.*x;
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40 ## stem (x, y, "b");
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41 ## @end group
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42 ## @end example
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43 ##
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44 ## @noindent
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45 ## plots 10 stems with heights from 2 to 20 in blue;
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46 ##
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47 ## The return value of @code{stem} is a vector if "stem series" graphics
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48 ## handles, with one handle per column of the variable @var{y}. This
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49 ## handle regroups the elements of the stem graph together as the
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50 ## children of the "stem series" handle, allowing them to be altered
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51 ## together. For example
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52 ##
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53 ## @example
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54 ## @group
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55 ## x = [0 : 10].';
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56 ## y = [sin(x), cos(x)]
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57 ## h = stem (x, y);
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58 ## set (h(2), "color", "g");
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59 ## set (h(1), "basevalue", -1)
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60 ## @end group
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61 ## @end example
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62 ##
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63 ## @noindent
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64 ## changes the color of the second "stem series" and moves the base line
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65 ## of the first.
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66 ## @seealso{bar, barh, plot}
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67 ## @end deftypefn
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68
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69 ## Author: Michel D. Schmid <michaelschmid@users.sourceforge.net>
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70 ## Adapted-by: jwe
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71
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72 function h = stem (varargin)
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73
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74 if (nargin < 1)
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75 print_usage ();
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76 endif
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77
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78 tmp = __stem__ (false, varargin{:});
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79
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80 if (nargout > 0)
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81 h = tmp;
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82 endif
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83
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84 endfunction
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85
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86 %!demo
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87 %! x = 1:10;
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88 %! stem (x);
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89
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90 %!demo
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91 %! x = 1:10;
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92 %! y = ones (1, length (x))*2.*x;
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93 %! stem (x, y);
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94
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95 %!demo
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96 %! x = 1:10;
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97 %! y = ones (size (x))*2.*x;
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98 %! h = stem (x, y, "b");
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99
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100 %!demo
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101 %! x = 1:10;
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102 %! y = ones (size (x))*2.*x;
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103 %! h = stem (x, y, "-.k");
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104
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105 %!demo
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106 %! x = 1:10;
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107 %! y = ones (size (x))*2.*x;
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108 %! h = stem (x, y, "-.k.");
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109
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110 %!demo
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111 %! x = 1:10;
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112 %! y = ones (size (x))*2.*x;
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113 %! h = stem (x, y, "fill");
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114
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115 %!demo
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116 %! x = [0 : 10].';
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117 %! y = [sin(x), cos(x)];
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118 %! h = stem (x, y);
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119 %! set (h(2), "color", "g");
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120 %! set (h(1), "basevalue", -1)