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Chapters:
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<a href="Introduction.html">1: Introduction</a><br>
<a href="SimpleExample.html">2: Simple example</a><br>
<a href="InvokingGri.html">3: Invocation</a><br>
<a href="GettingMoreControl.html">4: Finer Control</a><br>
<a href="X-Y.html">5: X-Y Plots</a><br>
<a href="ContourPlots.html">6: Contour Plots</a><br>
<a href="Images.html">7: Image Plots</a><br>
<a href="Examples.html">8: Examples</a><br>
<a href="Commands.html">9: Gri Commands</a><br>
<a href="Programming.html">10: Programming</a><br>
<a href="Environment.html">11: Environment</a><br>
<a href="Emacs.html">12: Emacs Mode</a><br>
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<h3>8.12.4: Combining columns from different files</h3>
Suppose you want to plot a column (`<font color="#82140F"><code>y</code></font>', say) from one file versus a
second column (`<font color="#82140F"><code>x</code></font>') from a second data file. The easy way is to
use a system command to create a new file, for example the Unix command
`<font color="#82140F"><code>paste</code></font>' -- but of course you don't want to clutter your filesystem
with such files, so you should do this withing Gri:
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open "paste file1 file2 |"
read columns x y
draw curve
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