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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>
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<a href="Commands.html">9: Gri Commands</a><br>
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<h3>9.3.7: `<font color="#82140F"><code>delete</code></font>'</h3>
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`delete .variable.|\synonym [.variable.|\synonym [...]]'
`delete columns [where missing]'
`delete columns [randomly .fraction.]'
`delete grid'
`delete [x|y] scale'
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<p>
Delete some item or characteristic.
<p>
<ul>
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<li> `<font color="#82140F"><code>delete .variable.</code></font>'
Delete definition of variable `<font color="#82140F"><code>.variable.</code></font>', making it undefined.
Any number of variables or synonyms may be specified on one line.
<p>
<li> `<font color="#82140F"><code>delete \synonym</code></font>'
Delete definition of synonym `<font color="#82140F"><code>\synonym</code></font>', making it undefined. Any
number of variables or synonyms may be specified on one line.
<p>
<li> `<font color="#82140F"><code>delete \@alias</code></font>'
Delete the item named by the alias (see <a href="Synonyms.html#AliasSynonyms">Alias Synonyms</a>).
<p>
<li> `<font color="#82140F"><code>delete</code></font>' with an `<font color="#82140F"><code>&</code></font>' item
Delete the item in the calling program.
<p>
<li> `<font color="#82140F"><code>delete columns</code></font>'
Delete column data.
<p>
<li> `<font color="#82140F"><code>delete columns where missing</code></font>'
Completely delete all column data for which any one of x, y, etc is missing.
<p>
<li> `<font color="#82140F"><code>delete columns randomly .fraction.</code></font>'
Randomly select fraction `<font color="#82140F"><code>.fraction.</code></font>' of the non-missing column
data, and designate them as being missing.
<p>
<li> `<font color="#82140F"><code>delete grid</code></font>'
Delete grid data.
<p>
<li> `<font color="#82140F"><code>delete scale</code></font>'
Delete scales for both x and y, so next `<font color="#82140F"><code>read columns</code></font>' will set it.
<p>
<li> `<font color="#82140F"><code>delete x scale</code></font>'
Delete scales for x, so next `<font color="#82140F"><code>read columns</code></font>' will set it.
<p>
<li> `<font color="#82140F"><code>delete y scale</code></font>'
Delete scales for y, so next `<font color="#82140F"><code>read columns</code></font>' will set it.
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