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<div><h1 id="a0000000085">3.6 Linked axes and galleries of plots</h1>
<p>In the previous chapter (Section <a href="ex-cmbrtemp.html">1.8.9</a>), linked axes were introduced as a mechanism by which several axes on a single plot could be set to have the same range, or to be algebraically related to one another. Another common use for them is to make several plots on a multiplot canvas share common axes. Just as the following statement links two axes on a single plot to one another </p><pre>
set axis x2 linked x
</pre><p> axes on the current plot can be linked to those of previous plots which are already on the multiplot canvas using syntax of the form: </p><pre>
set axis x2 linked item 2 x
</pre><p>A common reason for doing this is to produce galleries of side-by-side plots. The following series of commands would produce a <img src="images/img-0569.png" alt="$2\times 2$" style="vertical-align:0px;
width:39px;
height:12px" class="math gen" /> grid of plots, with axes only labelled along the bottom and left sides of the grid: </p><p> <small class="footnotesize"><tt class="ttfamily">set multiplot</tt><br /><tt class="ttfamily">set nodisplay</tt><br /><tt class="ttfamily">width=5.4</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily">set width width</tt><br /><tt class="ttfamily">set xrange [0:23.999]</tt><br /><tt class="ttfamily">set yrange [0:0.11]</tt><br /><tt class="ttfamily">set nokey</tt><br /><tt class="ttfamily">set texthalign left</tt><br /><tt class="ttfamily">set textvalign center</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily"># Plot 1 (bottom left)</tt><br /><tt class="ttfamily">set xlabel "$x$"</tt><br /><tt class="ttfamily">set ylabel ""</tt><br /><tt class="ttfamily">set label 1 "(c) fsteps" at graph width*0.03 , graph width/goldenRatio*0.9</tt><br /><tt class="ttfamily">plot "barchart1.dat" with fsteps, "" with points</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily">set axis x linked item 1 x</tt><br /><tt class="ttfamily">set axis y linked item 1 y</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily"># Plot 2 (bottom right)</tt><br /><tt class="ttfamily">set origin 1*width, 0*width/goldenRatio</tt><br /><tt class="ttfamily">set yformat ""</tt><br /><tt class="ttfamily">set label 1 "(d) histeps" at graph width*0.03 , graph width/goldenRatio*0.9</tt><br /><tt class="ttfamily">plot "barchart1.dat" with histeps, "" with points</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily"># Plot 3 (top left)</tt><br /><tt class="ttfamily">set origin 0*width, 1*width/goldenRatio</tt><br /><tt class="ttfamily">set xformat "" ; set xlabel ""</tt><br /><tt class="ttfamily">unset yformat ; set ylabel texify("poissonPDF(x,18)")</tt><br /><tt class="ttfamily">set label 1 "(a) impulses" at graph width*0.03 , graph width/goldenRatio*0.9</tt><br /><tt class="ttfamily">plot "barchart1.dat" with impulses, "" with points</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily"># Plot 4 (top right)</tt><br /><tt class="ttfamily">set origin 1*width, 1*width/goldenRatio</tt><br /><tt class="ttfamily">set yformat "" ; set ylabel ""</tt><br /><tt class="ttfamily">set label 1 "(b) steps" at graph width*0.03 , graph width/goldenRatio*0.9</tt><br /><tt class="ttfamily">plot "barchart1.dat" with steps, "" with points</tt><br /></small><br /><small class="footnotesize"><tt class="ttfamily"># Now that we are finished preparing multiplot, turn display on</tt><br /><tt class="ttfamily">set display</tt><br /><tt class="ttfamily">refresh</tt> </small> </p><p><center>
<img src="images/img-0571.png" alt="\includegraphics[width=\textwidth ]{examples/eps/ex_gallery}" style="width:" /></center> </p></div>
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