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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, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} axis (@var{limits}) |
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22 ## Set axis limits for plots. |
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23 ## |
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24 ## The argument @var{limits} should be a 2, 4, or 6 element vector. The |
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25 ## first and second elements specify the lower and upper limits for the x |
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26 ## axis. The third and fourth specify the limits for the y axis, and the |
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27 ## fifth and sixth specify the limits for the z axis. |
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28 ## |
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29 ## If your plot is already drawn, then you need to use @code{replot} before |
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30 ## the new axis limits will take effect. You can get this to happen |
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31 ## automatically by setting the built-in variable @code{automatic_replot} |
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32 ## to a nonzero value. |
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33 ## |
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34 ## Without any arguments, @code{axis} turns autoscaling on. |
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35 ## |
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36 ## The vector argument specifying limits is optional, and additional |
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37 ## string arguments may be used to specify various axis properties. For |
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38 ## example, |
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39 ## |
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40 ## @example |
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41 ## axis ([1, 2, 3, 4], "square"); |
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42 ## @end example |
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43 ## |
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44 ## @noindent |
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45 ## forces a square aspect ratio, and |
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46 ## |
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47 ## @example |
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48 ## axis ("labely", "tic"); |
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49 ## @end example |
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50 ## |
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51 ## @noindent |
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52 ## turns tic marks on for all axes and tic mark labels on for the y-axis |
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53 ## only. |
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54 ## |
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55 ## @noindent |
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56 ## The following options control the aspect ratio of the axes. |
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57 ## |
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58 ## @table @code |
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59 ## @item "square" |
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60 ## Force a square aspect ratio. |
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61 ## @item "equal" |
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62 ## Force x distance to equal y-distance. |
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63 ## @item "normal" |
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64 ## Restore the balance. |
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65 ## @end table |
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66 ## |
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67 ## @noindent |
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68 ## The following options control the way axis limits are interpreted. |
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69 ## |
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70 ## @table @code |
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71 ## @item "auto" |
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72 ## Set the specified axes to have nice limits around the data |
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73 ## or all if no axes are specified. |
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74 ## @item "manual" |
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75 ## Fix the current axes limits. |
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76 ## @item "tight" |
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77 ## Fix axes to the limits of the data (not implemented). |
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78 ## @end table |
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79 ## |
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80 ## @noindent |
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81 ## The option @code{"image"} is equivalent to @code{"tight"} and |
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82 ## @code{"equal"}. |
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83 ## |
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84 ## @noindent |
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85 ## The following options affect the appearance of tic marks. |
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86 ## |
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87 ## @table @code |
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88 ## @item "on" |
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89 ## Turn tic marks and labels on for all axes. |
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90 ## @item "off" |
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91 ## Turn tic marks off for all axes. |
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92 ## @item "tic[xyz]" |
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93 ## Turn tic marks on for all axes, or turn them on for the |
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94 ## specified axes and off for the remainder. |
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95 ## @item "label[xyz]" |
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96 ## Turn tic labels on for all axes, or turn them on for the |
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97 ## specified axes and off for the remainder. |
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98 ## @item "nolabel" |
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99 ## Turn tic labels off for all axes. |
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100 ## @end table |
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101 ## Note, if there are no tic marks for an axis, there can be no labels. |
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102 ## |
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103 ## @noindent |
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104 ## The following options affect the direction of increasing values on |
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105 ## the axes. |
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106 ## |
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107 ## @table @code |
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108 ## @item "ij" |
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109 ## Reverse y-axis, so lower values are nearer the top. |
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110 ## @item "xy" |
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111 ## Restore y-axis, so higher values are nearer the top. |
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112 ## @end table |
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113 ## @end deftypefn |
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114 |
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115 ## Author: jwe |
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116 |
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117 function curr_axis = axis (ax, varargin) |
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118 |
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119 ## This may not be correct if someone has used the gnuplot interface |
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120 ## directly... |
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121 |
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122 global __current_axis__ = [-10, 10, -10, 10]; |
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123 |
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124 ## To return curr_axis properly, octave needs to take control of scaling. |
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125 ## It isn't hard to compute good axis limits: |
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126 ## scale = 10 ^ floor (log10 (max - min) - 1); |
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127 ## r = scale * [floor (min / scale), ceil (max / scale)]; |
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128 ## However, with axis("manual") there is little need to know the current |
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129 ## limits. |
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130 |
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131 if (nargin == 0) |
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132 gset autoscale; |
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133 curr_axis = __current_axis__; |
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134 |
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135 elseif (isstr (ax)) |
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136 ax = tolower (ax); |
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137 |
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138 ## 'matrix mode' to reverse the y-axis |
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139 if (strcmp (ax, "ij")) |
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140 gset yrange [] reverse; |
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141 elseif (strcmp (ax, "xy")) |
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142 gset yrange [] noreverse; |
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143 |
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144 ## aspect ratio |
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145 elseif (strcmp (ax, "image")) |
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146 gset size ratio -1; |
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147 gset autoscale; ## XXX FIXME XXX should be the same as "tight" |
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148 elseif (strcmp (ax, "equal")) |
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149 gset size ratio -1; |
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150 elseif (strcmp (ax, "square")) |
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151 gset size ratio 1; |
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152 elseif (strcmp (ax, "normal")) |
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153 gset size noratio; |
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154 |
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155 |
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156 ## axis limits |
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157 elseif (length (ax) >= 4 && strcmp (ax (1:4), "auto")) |
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158 if length (ax) > 4 |
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159 eval (["gset autoscale ", ax (5 : length (ax)), ";"]); |
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160 else |
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161 gset autoscale; |
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162 endif |
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163 elseif (strcmp (ax, "manual")) |
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164 ## fixes the axis limits, like axis(axis) should; |
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165 gset xrange [] writeback; |
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166 gset yrange [] writeback; |
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167 gset zrange [] writeback; |
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168 ## XXX FIXME XXX if writeback were set in plot, no need to replot here. |
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169 replot; |
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170 gset noautoscale x; |
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171 gset noautoscale y; |
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172 gset noautoscale z; |
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173 elseif (strcmp (ax, "tight")) |
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174 ## XXX FIXME XXX if tight, plot must set ranges to limits of the |
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175 ## all the data on the current plot, even if from a previous call. |
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176 ## Instead, just let gnuplot do as it likes. |
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177 gset autoscale; |
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178 |
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179 |
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180 ## tic marks |
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181 elseif (strcmp (ax, "on")) |
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182 gset xtics; |
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183 gset ytics; |
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184 gset ztics; |
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185 gset format; |
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186 elseif (strcmp (ax, "off")) |
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187 gset noxtics; |
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188 gset noytics; |
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189 gset noztics; |
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190 elseif (strcmp (ax, "tic")) |
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191 gset xtics; |
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192 gset ytics; |
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193 gset ztics; |
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194 elseif (length (ax) > 3 && strcmp (ax (1:3), "tic")) |
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195 if any (ax == "x") |
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196 gset xtics; |
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197 else |
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198 gset noxtics; |
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199 endif |
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200 if any (ax == "y") |
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201 gset ytics; |
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202 else |
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203 gset noytics; |
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204 endif |
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205 if any (ax == "z") |
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206 gset ztics; |
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207 else |
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208 gset noztics; |
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209 endif |
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210 elseif (strcmp (ax, "label")) |
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211 gset format; |
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212 elseif (strcmp (ax, "nolabel")) |
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213 gset format "\\0"; |
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214 elseif (length (ax) > 5 && strcmp (ax (1:5), "label")) |
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215 if any (ax == "x") |
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216 gset format x; |
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217 else |
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218 gset format x "\\0"; |
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219 endif |
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220 if any (ax == "y") |
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221 gset format y; |
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222 else |
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223 gset format y "\\0"; |
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224 endif |
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225 if any (ax == "z") |
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226 gset format z; |
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227 else |
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228 gset format z "\\0"; |
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229 endif |
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230 |
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231 else |
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232 warning (["unknown axis option '", ax, "'"]); |
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233 endif |
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234 |
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235 elseif (is_vector (ax)) |
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236 |
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237 len = length (ax); |
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238 |
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239 if (len != 2 && len != 4 && len != 6) |
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240 error ("axis: expecting vector with 2, 4, or 6 elements"); |
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241 endif |
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242 |
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243 __current_axis__ = reshape (ax, 1, len); |
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244 |
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245 if (len > 1) |
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246 eval (sprintf ("gset xrange [%g:%g];", ax (1), ax (2))); |
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247 endif |
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248 |
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249 if (len > 3) |
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250 eval (sprintf ("gset yrange [%g:%g];", ax (3), ax (4))); |
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251 endif |
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252 |
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253 if (len > 5) |
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254 eval (sprintf ("gset zrange [%g:%g];", ax (5), ax (6))); |
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255 endif |
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256 |
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257 else |
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258 error ("axis: expecting no args, or a vector with 2, 4, or 6 elements"); |
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259 endif |
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260 |
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261 if (nargin > 1) |
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262 axis (varargin{:}); |
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263 endif |
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264 endfunction |
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265 |
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266 %!demo |
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267 %! t=0:0.01:2*pi; x=sin(t); |
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268 %! |
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269 %! subplot(221); title("normal plot"); |
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270 %! plot(t, x, ";;"); |
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271 %! |
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272 %! subplot(222); title("square plot"); |
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273 %! axis("square"); plot(t, x, ";;"); |
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274 %! |
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275 %! subplot(223); title("equal plot"); |
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276 %! axis("equal"); plot(t, x, ";;"); |
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277 %! |
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278 %! subplot(224); title("normal plot again"); |
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279 %! axis("normal"); plot(t, x, ";;"); |
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280 |
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281 %!demo |
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282 %! t=0:0.01:2*pi; x=sin(t); |
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283 %! |
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284 %! subplot(121); title("ij plot"); |
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285 %! axis("ij"); plot(t, x, ";;"); |
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286 %! |
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287 %! subplot(122); title("xy plot"); |
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288 %! axis("xy"); plot(t, x, ";;"); |
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289 |
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290 %!demo |
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291 %! t=0:0.01:2*pi; x=sin(t); |
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292 %! |
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293 %! subplot(331); title("x tics & labels"); |
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294 %! axis("ticx"); plot(t, x, ";;"); |
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295 %! |
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296 %! subplot(332); title("y tics & labels"); |
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297 %! axis("ticy"); plot(t, x, ";;"); |
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298 %! |
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299 %! subplot(334); title("x & y tics, x labels"); |
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300 %! axis("labelx","tic"); plot(t, x, ";;"); |
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301 %! |
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302 %! subplot(335); title("x & y tics, y labels"); |
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303 %! axis("labely","tic"); plot(t, x, ";;"); |
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304 %! |
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305 %! subplot(337); title("x tics, no labels"); |
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306 %! axis("nolabel","ticx"); plot(t, x, ";;"); |
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307 %! |
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308 %! subplot(338); title("y tics, no labels"); |
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309 %! axis("nolabel","ticy"); plot(t, x, ";;"); |
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310 %! |
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311 %! subplot(333); title("no tics or labels"); |
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312 %! axis("off"); plot(t, x, ";;"); |
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313 %! |
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314 %! subplot(336); title("all tics but no labels"); |
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315 %! axis("nolabel","tic"); plot(t, x, ";;"); |
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316 %! |
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317 %! subplot(339); title("all tics & labels"); |
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318 %! axis("on"); plot(t, x, ";;"); |
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319 |
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320 %!demo |
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321 %! t=0:0.01:2*pi; x=sin(t); |
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322 %! |
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323 %! subplot(321); title("axes at [0 3 0 1]") |
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324 %! axis([0,3,0,1]); plot(t, x, ";;"); |
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325 %! |
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326 %! subplot(322); title("auto"); |
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327 %! axis("auto"); plot(t, x, ";;"); |
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328 %! |
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329 %! subplot(323); title("manual"); |
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330 %! plot(t, x, ";sine [0:2pi];"); hold on; |
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331 %! axis("manual"); |
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332 %! plot(-3:3,-3:3, ";line (-3,-3)->(3,3);"); hold off; |
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333 %! |
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334 %! subplot(324); title("axes at [0 3 0 1], then autox"); |
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335 %! axis([0,3,0,1]); axis("autox"); |
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336 %! plot(t, x, ";sine [0:2pi];"); |
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337 %! |
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338 %! subplot(325); title("axes at [3 6 0 1], then autoy"); |
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339 %! axis([3,6,0,1]); axis("autoy"); |
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340 %! plot(t, x, ";sine [0:2p];"); |
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341 %! |
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342 %! subplot(326); title("tight"); |
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343 %! axis("tight"); plot(t, x, ";;"); |
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344 %! % The last plot should not have any whitespace outside the data |
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345 %! % limits, but "tight" isn't implemented yet. |
