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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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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} {} plot (@var{args}) |
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22 ## This function produces two-dimensional plots. Many different |
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23 ## combinations of arguments are possible. The simplest form is |
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24 ## |
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25 ## @example |
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26 ## plot (@var{y}) |
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27 ## @end example |
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28 ## |
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29 ## @noindent |
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30 ## where the argument is taken as the set of @var{y} coordinates and the |
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31 ## @var{x} coordinates are taken to be the indices of the elements, |
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32 ## starting with 1. |
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33 ## |
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34 ## To save a plot, in one of several image formats such as PostScript |
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35 ## or PNG, use the @code{print} command. |
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36 ## |
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37 ## If more than one argument is given, they are interpreted as |
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38 ## |
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39 ## @example |
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40 ## plot (@var{x}, @var{y}, @var{fmt} ...) |
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41 ## @end example |
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42 ## |
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43 ## @noindent |
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44 ## where @var{y} and @var{fmt} are optional, and any number of argument |
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45 ## sets may appear. The @var{x} and @var{y} values are |
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46 ## interpreted as follows: |
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47 ## |
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48 ## @itemize @bullet |
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49 ## @item |
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50 ## If a single data argument is supplied, it is taken as the set of @var{y} |
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51 ## coordinates and the @var{x} coordinates are taken to be the indices of |
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52 ## the elements, starting with 1. |
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53 ## |
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54 ## @item |
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55 ## If the @var{x} is a vector and @var{y} is a matrix, the |
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56 ## the columns (or rows) of @var{y} are plotted versus @var{x}. |
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57 ## (using whichever combination matches, with columns tried first.) |
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58 ## |
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59 ## @item |
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60 ## If the @var{x} is a matrix and @var{y} is a vector, |
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61 ## @var{y} is plotted versus the columns (or rows) of @var{x}. |
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62 ## (using whichever combination matches, with columns tried first.) |
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63 ## |
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64 ## @item |
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65 ## If both arguments are vectors, the elements of @var{y} are plotted versus |
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66 ## the elements of @var{x}. |
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67 ## |
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68 ## @item |
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69 ## If both arguments are matrices, the columns of @var{y} are plotted |
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70 ## versus the columns of @var{x}. In this case, both matrices must have |
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71 ## the same number of rows and columns and no attempt is made to transpose |
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72 ## the arguments to make the number of rows match. |
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73 ## |
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74 ## If both arguments are scalars, a single point is plotted. |
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75 ## @end itemize |
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76 ## |
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77 ## If the @var{fmt} argument is supplied, it is interpreted as |
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78 ## follows. If @var{fmt} is missing, the default gnuplot line style |
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79 ## is assumed. |
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80 ## |
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81 ## @table @samp |
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82 ## @item - |
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83 ## Set lines plot style (default). |
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84 ## |
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85 ## @item . |
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86 ## Set dots plot style. |
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87 ## |
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88 ## @item ^ |
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89 ## Set impulses plot style. |
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90 ## |
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91 ## @item L |
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92 ## Set steps plot style. |
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93 ## |
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94 ## @item @var{n} |
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95 ## Interpreted as the plot color if @var{n} is an integer in the range 1 to |
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96 ## 6. |
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97 ## |
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98 ## @item @var{nm} |
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99 ## If @var{nm} is a two digit integer and @var{m} is an integer in the |
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100 ## range 1 to 6, @var{m} is interpreted as the point style. This is only |
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101 ## valid in combination with the @code{@@} or @code{-@@} specifiers. |
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102 ## |
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103 ## @item @var{c} |
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104 ## If @var{c} is one of @code{"k"} (black), @code{"r"} (red), @code{"g"} |
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105 ## (green), @code{"b"} (blue), @code{"m"} (magenta), @code{"c"} (cyan), |
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106 ## or @code{"w"} (white), it is interpreted as the line plot color. |
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107 ## |
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108 ## @item ";title;" |
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109 ## Here @code{"title"} is the label for the key. |
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110 ## |
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111 ## @item + |
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112 ## @itemx * |
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113 ## @itemx o |
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114 ## @itemx x |
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115 ## Used in combination with the points or linespoints styles, set the point |
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116 ## style. |
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117 ## @end table |
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118 ## |
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119 ## The color line styles have the following meanings on terminals that |
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120 ## support color. |
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121 ## |
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122 ## @example |
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123 ## Number Gnuplot colors (lines)points style |
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124 ## 1 red * |
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125 ## 2 green + |
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126 ## 3 blue o |
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127 ## 4 magenta x |
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128 ## 5 cyan house |
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129 ## 6 brown there exists |
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130 ## @end example |
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131 ## |
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132 ## The @var{fmt} argument can also be used to assign key titles. |
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133 ## To do so, include the desired title between semi-colons after the |
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134 ## formatting sequence described above, e.g. "+3;Key Title;" |
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135 ## Note that the last semi-colon is required and will generate an error if |
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136 ## it is left out. |
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137 ## |
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138 ## Here are some plot examples: |
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139 ## |
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140 ## @example |
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141 ## plot (x, y, "@@12", x, y2, x, y3, "4", x, y4, "+") |
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142 ## @end example |
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143 ## |
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144 ## This command will plot @code{y} with points of type 2 (displayed as |
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145 ## @samp{+}) and color 1 (red), @code{y2} with lines, @code{y3} with lines of |
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146 ## color 4 (magenta) and @code{y4} with points displayed as @samp{+}. |
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147 ## |
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148 ## @example |
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149 ## plot (b, "*") |
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150 ## @end example |
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151 ## |
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152 ## This command will plot the data in the variable @code{b} will be plotted |
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153 ## with points displayed as @samp{*}. |
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154 ## |
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155 ## @example |
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156 ## t = 0:0.1:6.3; |
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157 ## plot (t, cos(t), "-;cos(t);", t, sin(t), "+3;sin(t);"); |
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158 ## @end example |
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159 ## |
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160 ## This will plot the cosine and sine functions and label them accordingly |
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161 ## in the key. |
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162 ## @seealso{semilogx, semilogy, loglog, polar, mesh, contour, __pltopt__ |
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163 ## bar, stairs, errorbar, replot, xlabel, ylabel, title, print} |
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164 ## @end deftypefn |
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165 |
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166 ## Author: jwe |
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167 |
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168 function retval = plot (varargin) |
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169 |
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170 newplot (); |
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171 |
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172 tmp = __plt__ ("plot", gca (), varargin{:}); |
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173 |
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174 if (nargout > 0) |
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175 retval = tmp; |
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176 endif |
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177 |
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178 endfunction |
