annotate scripts/plot/stem.m @ 10846:a4f482e66b65

Grammarcheck more of the documentation. Use @noindent macro appropriately. Limit line length to 80 characters.
author Rik <octave@nomad.inbox5.com>
date Sun, 01 Aug 2010 20:22:17 -0700
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1 ## Copyright (C) 2006, 2007, 2008, 2009 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} {} stem (@var{x})
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21 ## @deftypefnx {Function File} {} stem (@var{x}, @var{y})
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22 ## @deftypefnx {Function File} {} stem (@var{x}, @var{y}, @var{linespec})
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23 ## @deftypefnx {Function File} {} stem (@dots{}, "filled")
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24 ## @deftypefnx {Function File} {@var{h} =} stem (@dots{})
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25 ## Plot a stem graph from two vectors of x-y data. If only one argument
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26 ## is given, it is taken as the y-values and the x coordinates are taken
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27 ## from the indices of the elements.
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28 ##
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29 ## If @var{y} is a matrix, then each column of the matrix is plotted as
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30 ## a separate stem graph. In this case @var{x} can either be a vector,
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31 ## the same length as the number of rows in @var{y}, or it can be a
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32 ## matrix of the same size as @var{y}.
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33 ##
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34 ## The default color is @code{"b"} (blue). The default line style is
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35 ## @code{"-"} and the default marker is @code{"o"}. The line style can
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36 ## be altered by the @code{linespec} argument in the same manner as the
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37 ## @code{plot} command. For example,
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38 ##
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39 ## @example
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40 ## @group
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41 ## x = 1:10;
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42 ## y = ones (1, length (x))*2.*x;
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43 ## stem (x, y, "r");
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44 ## @end group
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45 ## @end example
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46 ##
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47 ## @noindent
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48 ## plots 10 stems with heights from 2 to 20 in red;
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49 ##
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50 ## The return value of @code{stem} is a vector of "stem series" graphics
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51 ## handles, with one handle per column of the variable @var{y}. This
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52 ## handle regroups the elements of the stem graph together as the
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53 ## children of the "stem series" handle, allowing them to be altered
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54 ## together. For example,
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55 ##
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56 ## @example
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57 ## @group
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58 ## x = [0 : 10]';
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59 ## y = [sin(x), cos(x)]
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60 ## h = stem (x, y);
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61 ## set (h(2), "color", "g");
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62 ## set (h(1), "basevalue", -1)
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63 ## @end group
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64 ## @end example
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65 ##
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66 ## @noindent
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67 ## changes the color of the second "stem series" and moves the base line
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68 ## of the first.
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69 ## @seealso{bar, barh, plot}
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70 ## @end deftypefn
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71
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72 ## Author: Michel D. Schmid <michaelschmid@users.sourceforge.net>
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73 ## Adapted-by: jwe
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74
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75 function h = stem (varargin)
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76
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77 if (nargin < 1)
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78 print_usage ();
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79 endif
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80
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81 tmp = __stem__ (false, varargin{:});
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82
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83 if (nargout > 0)
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84 h = tmp;
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85 endif
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86
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87 endfunction
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88
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89 %!demo
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90 %! x = 1:10;
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91 %! stem (x);
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92
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93 %!demo
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94 %! x = 1:10;
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95 %! y = ones (1, length (x))*2.*x;
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96 %! stem (x, y);
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97
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98 %!demo
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99 %! x = 1:10;
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100 %! y = ones (size (x))*2.*x;
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101 %! h = stem (x, y, "r");
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102
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103 %!demo
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104 %! x = 1:10;
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105 %! y = ones (size (x))*2.*x;
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106 %! h = stem (x, y, "-.k");
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107
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108 %!demo
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109 %! x = 1:10;
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110 %! y = ones (size (x))*2.*x;
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111 %! h = stem (x, y, "-.k.");
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112
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113 %!demo
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114 %! x = 1:10;
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115 %! y = ones (size (x))*2.*x;
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116 %! h = stem (x, y, "filled");
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117
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118 %!demo
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119 %! x = [0 : 10]';
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120 %! y = [sin(x), cos(x)];
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121 %! h = stem (x, y);
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122 %! set (h(2), "color", "g");
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123 %! set (h(1), "basevalue", -1)