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1 ## Copyright (C) 2006 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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {@var{h} =} stem (@var{x}, @var{y}, @var{linespec}) |
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22 ## Plot a stem graph and return the handles of hte line and marker |
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23 ## objects used to draw the stems. The default color is @code{"r"} |
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24 ## (red). The default line style is @code{"-"} and the default marker is |
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25 ## @code{"o"}. |
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26 ## |
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27 ## For example, |
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28 ## @example |
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29 ## x = 1:10; |
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30 ## stem (x); |
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31 ## @end example |
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32 ## @noindent |
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33 ## plots 10 stems with hights from 1 to 10; |
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34 ## |
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35 ## @example |
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36 ## x = 1:10; |
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37 ## y = ones (1, length (x))*2.*x; |
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38 ## stem (x, y); |
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39 ## @end example |
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40 ## @noindent |
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41 ## plots 10 stems with hights from 2 to 20; |
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42 ## |
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43 ## @example |
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44 ## x = 1:10; |
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45 ## y = ones (size (x))*2.*x; |
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46 ## h = stem (x, y, "b"); |
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47 ## @end example |
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48 ## @noindent |
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49 ## plots 10 bars with hights from 2 to 20 |
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50 ## (the color is blue, and @var{h} is a 2-by-10 array of handles in |
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51 ## which the first row holds the line handles and the |
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52 ## the second row holds the marker handles); |
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53 ## |
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54 ## @example |
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55 ## x = 1:10; |
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56 ## y = ones (size (x))*2.*x; |
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57 ## h = stem (x, y, "-.k"); |
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58 ## @end example |
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59 ## @noindent |
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60 ## plots 10 stems with hights from 2 to 20 |
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61 ## (the color is black, line style is @code{"-."}, and @var{h} is a 2-by-10 |
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62 ## array of handles in which the first row holds the line handles and |
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63 ## the second rows holds the marker handles); |
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64 ## |
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65 ## @example |
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66 ## x = 1:10; |
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67 ## y = ones (size (x))*2.*x; |
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68 ## h = stem (x, y, "-.k."); |
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69 ## @end example |
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70 ## @noindent |
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71 ## plots 10 stems with hights from 2 to 20 |
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72 ## (the color is black, line style is @code{"-."} and the marker style |
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73 ## is @code{"."}, and @var{h} is a 2-by-10 array of handles in which the |
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74 ## first row holds the line handles and the second row holds the marker |
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75 ## handles); |
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76 ## |
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77 ## @example |
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78 ## x = 1:10; |
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79 ## y = ones (size (x))*2.*x; |
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80 ## h = stem (x, y, "fill"); |
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81 ## @end example |
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82 ## @noindent |
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83 ## plots 10 stems with hights from 2 to 20 |
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84 ## (the color is rgb-triple defined, the line style is @code{"-"}, |
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85 ## the marker style is @code{"o"}, and @var{h} is a 2-by-10 array of |
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86 ## handles in which the first row holds the line handles and the second |
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87 ## row holds the marker handles). |
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88 ## |
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89 ## Color definitions with rgb-triples are not valid! |
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90 ## |
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91 ## @seealso{bar, barh, plot} |
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92 ## @end deftypefn |
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93 |
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94 ## Author: Michel D. Schmid <michaelschmid@users.sourceforge.net> |
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95 ## Adapted-by: jwe |
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96 |
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97 function h = stem (varargin) |
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98 |
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99 if (nargin < 1 || nargin > 4) |
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100 print_usage (); |
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101 endif |
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102 |
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103 [x, y, dofill, lc, ls, mc, ms] = check_stem_arg (varargin{:}); |
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104 |
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105 newplot (); |
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106 |
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107 ## first, plot the lines.. without marker |
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108 ## Use a loop and calls to line here because setting properties this |
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109 ## way doesn't work with plot yet. |
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110 idxhh = 0; |
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111 for i = 1:numel(x) |
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112 hh(++idxhh) = line ([x(i); x(i)], [0; y(i)], "color", lc, "linestyle", ls); |
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113 endfor |
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114 |
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115 ## second, plot the markers.. |
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116 hhh = []; |
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117 hhhh = []; |
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118 |
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119 ## Use a loop and calls to line here because setting properties this |
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120 ## way doesn't work with plot yet. |
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121 idxhhh = 0; |
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122 for i = 1:numel(x) |
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123 hhh(++idxhhh) = line ([x(i); x(i)], [y(i); y(i)]); |
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124 endfor |
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125 |
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126 if (find (y < 0)) |
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127 x_axis_range = get (gca, "xlim"); |
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128 hhhh = line (x_axis_range, [0, 0], "color", "k"); |
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129 endif |
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130 |
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131 if (dofill) |
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132 set (hhh, "markerfacecolor", mc); |
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133 endif |
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134 |
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135 if (nargout > 0) |
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136 if (! isempty (hhhh)) |
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137 hhhh = hhhh*(ones (length (hh), 1))'; |
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138 endif |
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139 h = [hh; hhh; hhhh]; |
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140 endif |
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141 |
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142 endfunction |
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143 |
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144 function [x, y, dofill, lc, ls, mc, ms] = check_stem_arg (varargin) |
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145 |
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146 ## set specifiers to default values |
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147 [lc, ls, mc, ms] = set_default_values (); |
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148 dofill = 0; |
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149 fill_2 = 0; |
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150 linespec_2 = 0; |
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151 |
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152 ## check input arguments |
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153 if (nargin == 1) |
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154 y = varargin{1}; |
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155 if (isvector (y)) |
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156 x = 1:length(y); |
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157 elseif (ismatrix (y)) |
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158 x = 1:rows(y); |
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159 else |
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160 error ("stem: Y must be a matrix"); |
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161 endif # in each case, x & y will be defined |
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162 |
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163 elseif (nargin == 2) |
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164 ## several possibilities |
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165 ## 1. the real y data |
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166 ## 2. 'fill' |
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167 ## 3. line spec |
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168 if (ischar (varargin{2})) |
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169 ## only 2. or 3. possible |
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170 if (strcmp ("fill", varargin{2})) |
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171 dofill = 1; |
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172 else |
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173 ## parse the linespec |
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174 [lc, ls, mc, ms] = stem_line_spec (varargin{2}); |
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175 endif |
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176 y = varargin{1}; |
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177 if (isvector (y)) |
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178 x = 1:length(y); |
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179 elseif (ismatrix (y)) |
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180 x = 1:rows(y); |
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181 else |
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182 error ("stem: Y must be a matrix"); |
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183 endif # in each case, x & y will be defined |
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184 else |
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185 ## must be the real y data |
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186 x = varargin{1}; |
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187 y = varargin{2}; |
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188 if (! (ismatrix (x) && ismatrix (y))) |
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189 error ("stem: X and Y must be matrices"); |
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190 endif |
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191 endif |
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192 elseif (nargin == 3) |
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193 ## again several possibilities |
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194 ## arg2 1. real y |
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195 ## arg2 2. 'fill' or linespec |
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196 ## arg3 1. 'fill' or linespec |
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197 if (ischar (varargin{2})) |
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198 ## only arg2 2. / arg3 1. & arg3 3. are possible |
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199 if (strcmp ("fill", varargin{2})) |
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200 dofill = 1; |
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201 fill_2 = 1; # be sure, no second "fill" is in the arguments |
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202 else |
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203 ## must be a linespec |
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204 [lc, ls, mc, ms] = stem_line_spec (varargin{2}); |
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205 linespec_2 = 1; |
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206 endif |
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207 y = varargin{1}; |
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208 if (isvector (y)) |
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209 x = 1:length(y); |
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210 elseif (ismatrix (y)) |
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211 x = 1:size(y,1); |
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212 else |
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213 error ("stem: Y must be a matrix"); |
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214 endif # in each case, x & y will be defined |
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215 else |
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216 ## must be the real y data |
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217 x = varargin{1}; |
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218 y = varargin{2}; |
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219 if (! (ismatrix (x) && ismatrix (y))) |
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220 error ("stem: X and Y must be matrices"); |
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221 endif |
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222 endif # if ischar(varargin{2}) |
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223 ## varargin{3} must be char... |
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224 ## check for "fill" .. |
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225 if (strcmp ("fill", varargin{3}) & fill_2) |
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226 error ("stem:check_stem_arg: duplicate fill argument"); |
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227 elseif (strcmp("fill", varargin{3}) & linespec_2) |
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228 # must be "fill" |
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229 dofill = 1; |
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230 fill_2 = 1; |
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231 elseif (strcmp ("fill", varargin{3}) & ! linespec_2) |
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232 ## must be "fill" |
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233 dofill = 1; |
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234 fill_2 = 1; |
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235 elseif (! linespec_2) |
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236 ## must be linespec |
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237 [lc, ls, mc, ms] = stem_line_spec (varargin{3}); |
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238 linespec_2 = 1; |
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239 endif |
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240 elseif (nargin == 4) |
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241 x = varargin{1}; |
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242 y = varargin{2}; |
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243 if (! (ismatrix (x) && ismatrix (y))) |
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244 error ("X and Y must be matrices"); |
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245 endif |
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246 |
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247 if (strcmp ("fill", varargin{3})) |
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248 dofill = 1; |
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249 fill_2 = 1; # be sure, no second "fill" is in the arguments |
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250 else |
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251 ## must be a linespec |
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252 [lc, ls, mc, ms] = stem_line_spec (varargin{3}); |
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253 linespec_2 = 1; |
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254 endif |
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255 |
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256 ## check for "fill" .. |
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257 if (strcmp ("fill", varargin{4}) & fill_2) |
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258 error ("stem:check_stem_arg: duplicate fill argument"); |
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259 elseif (strcmp ("fill", varargin{4}) & linespec_2) |
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260 ## must be "fill" |
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261 dofill = 1; |
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262 fill_2 = 1; |
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263 elseif (! strcmp ("fill", varargin{4}) & ! linespec_2) |
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264 ## must be linespec |
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265 [lc, ls, mc, ms] = stem_line_spec (varargin{4}); |
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266 linespec_2 = 1; |
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267 endif |
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268 endif |
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269 |
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270 endfunction |
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271 |
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272 function [lc, ls, mc, ms] = stem_line_spec (str) |
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273 if (! ischar (str)) |
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274 error ("stem:stem_line_spec: wrong argument type, must be \"fill\" or a string of specifiers"); |
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275 endif |
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276 [lc, ls, mc, ms] = set_default_values (); |
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277 ## Parse the line specifier string. |
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278 cur_props = __pltopt__ ("stem", str); |
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279 for i = 1:length(cur_props) |
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280 if (isfield (cur_props(i), "markeredgecolor")) |
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281 mc = cur_props(i).markeredgecolor; |
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282 elseif (isfield (cur_props(i), "color")); # means line color |
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283 lc = cur_props(i).color; |
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284 elseif (isfield (cur_props(i), "linestyle")) |
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285 ls = cur_props(i).linestyle; |
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286 elseif (isfield (cur_props(i), "marker")) |
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287 ms = cur_props(i).marker; |
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288 endif |
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289 endfor |
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290 endfunction |
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291 |
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292 function [lc, ls, mc, ms] = set_default_values () |
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293 ## set default values |
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294 mc = "r"; |
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295 lc = "r"; |
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296 ls = "-"; |
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297 ms = "o"; |
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298 endfunction |
