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<br>
Chapters:
<br>
&nbsp;&nbsp;<a href="Introduction.html">1: Introduction</a><br>
&nbsp;&nbsp;<a href="SimpleExample.html">2: Simple example</a><br>
&nbsp;&nbsp;<a href="InvokingGri.html">3: Invocation</a><br>
&nbsp;&nbsp;<a href="GettingMoreControl.html">4: Finer Control</a><br>
&nbsp;&nbsp;<a href="X-Y.html">5: X-Y Plots</a><br>
&nbsp;&nbsp;<a href="ContourPlots.html">6: Contour Plots</a><br>
&nbsp;&nbsp;<a href="Images.html">7: Image Plots</a><br>
&nbsp;&nbsp;<a href="Examples.html">8: Examples</a><br>
&nbsp;&nbsp;<a href="Commands.html">9: Gri Commands</a><br>
&nbsp;&nbsp;<a href="Programming.html">10: Programming</a><br>
&nbsp;&nbsp;<a href="Environment.html">11: Environment</a><br>
&nbsp;&nbsp;<a href="Emacs.html">12: Emacs Mode</a><br>
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&nbsp;&nbsp;<a href="Installation.html">14: Installation</a><br>
&nbsp;&nbsp;<a href="Bugs.html">15: Gri Bugs</a><br>
&nbsp;&nbsp;<a href="TestSuite.html">16: Test Suite</a><br>
&nbsp;&nbsp;<a href="GriInThePress.html">17: Gri in Press</a><br>
&nbsp;&nbsp;<a href="Acknowledgments.html">18: Acknowledgments</a><br>
&nbsp;&nbsp;<a href="License.html">19: License</a><br>
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Indices:<br>
&nbsp;&nbsp;<a href="ConceptIndex.html"><i>Concepts</i></a><br>
&nbsp;&nbsp;<a href="CommandIndex.html"><i>Commands</i></a><br>
&nbsp;&nbsp;<a href="BuiltinIndex.html"><i>Variables</i></a><br>
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<h3>9.3.25: `<font color="#82140F"><code>new</code></font>'</h3>

<!-- latex: \index{new} -->

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<PRE>
<font color="#82140F">
new .variable_name. | \synonym_name \
   [.variable_name. | \synonym_name \
   [...]]
</font></PRE>
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<p>

`<font color="#82140F"><code>new</code></font>' sets aside storage for new version of the named variable(s)
and/or synonym(s).  Any number of variables and synonyms may be
specified.  If a given variable/synonym already exists, this will create
a new version of it, and future assignments will be stored in this new
version <b>without</b> affecting the pre-existing version.  If the
variable/synonym is `<font color="#82140F"><code>delete</code></font>'ed, the new version is deleted, making
the old, unaltered, version accessible again.
<p>
This command is used mostly for temporary use, to prevent clashing with
existing values.  Suppose you want to change the font size inside a new
command or an if block.  Then you might do the following, where the
variable `<font color="#82140F"><code>.tmp.</code></font>' is used to store the old font size.  Note that the
use of the `<font color="#82140F"><code>new/delete</code></font>' statements prevents the assignment to the
local version of the variable `<font color="#82140F"><code>.tmp.</code></font>' from affecting the value
known outside the `<font color="#82140F"><code>if</code></font>' block, if in fact `<font color="#82140F"><code>.tmp.</code></font>' happened to
exist outside the block.
<p>
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<PRE>
<font color="#82140F">
set font size 10
draw label "This is in fontsize 10" at 10 2 cm
if .want_title.
  new .tmp.
  .tmp. = ..fontsize..
  set font size 22
  draw label "This is 22 font" at 10 5 cm
  set font size .tmp.
  delete .tmp.
end if
draw label "This is 10 font" at 10 8 cm
</font></PRE>
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<p>
<b>Special case</b>: for local synonyms (e.g. `<font color="#82140F"><code>\.word1.</code></font>', etc.),
the `<font color="#82140F"><code>new</code></font>' operator checks to see whether the synonym is standing
for an "ampersand" argument, signalling a changeable argument that is a
variable or a synonym.  In such a case, `<font color="#82140F"><code>new</code></font>' creates a new
instance of the item in the calling context.  The test suite has
examples (see <a href="TestSuite.html#TestSuite">Test Suite</a>).
<p>
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