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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>
<a href="History.html">13: History</a><br>
<a href="Installation.html">14: Installation</a><br>
<a href="Bugs.html">15: Gri Bugs</a><br>
<a href="TestSuite.html">16: Test Suite</a><br>
<a href="Acknowledgments.html">17: Acknowledgments</a><br>
<a href="License.html">18: License</a><br>
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Indices:</br>
<a href="ConceptIndex.html"><i>Concepts</i></a><br>
<a href="CommandIndex.html"><i>Commands</i></a><br>
<a href="BuiltinIndex.html"><i>Variables</i></a><br>
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<h3>10.9.6: Solitary Operators</h3>
Solitary operators do not act on items on the stack; rather, they
generate items themselves and insert them on the stack.
<p>
The solitary operators are illustrated below, in alphabetical order.
<p>
<dl>
<dt> <tt>{rpn argc}</tt>
<dd>Yields number of command-line arguments given by the user when Gri was
invoked. Thus, invoking Gri as
<p>
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<PRE>
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gri myfile.gri file1.dat file2.dat
</font></PRE>
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<p>
yields 3, for arguments `<font color="#82140F"><samp>myfile.gri</samp></font>', `<font color="#82140F"><code>file1.dat</code></font>',
and `<font color="#82140F"><code>file2.dat</code></font>'. These arguments are accessible through
the `<font color="82140F"><code>argv</code></font>' unary operator (see <a href="UnaryOperators.html#UnaryOperators">Unary Operators</a>).
<p>
<dt> <tt>{rpn e}</tt>
<dd>Yields the base of natural logarithms, i.e. `<font color="#82140F"><code>2.718</code></font>'...
<p>
<dt> <tt>{rpn pi}</tt>
<dd>Yields Pi, i.e. `<font color="#82140F"><code>3.141</code></font>'...
<p>
<dt> <tt>{rpn rand}</tt>
<dd>Generate a random number in the range 0 to 1, using the C subroutine
`<font color="#82140F"><code>drand48()</code></font>' if it is available, otherwise the less well-distributed
`<font color="#82140F"><code>rand()</code></font>' subroutine.
<p>
<dt> <tt>{rpn wordc}</tt>
<dd>Returns number of words used in invoking the present command. Similar
to the `<font color="82140F"><code>\.words.</code></font>' synonym (see <a href="Synonyms.html#LocalSynonyms">Local Synonyms</a>). Example:
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<PRE>
<font color="#82140F">
`let us test .it.'
{
show "This command has " {rpn wordc} " words"
}
let us test 10
let us test {rpn 3 1 +}
let us test "this"
let us test "this thing"
</font></PRE>
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<p>
The operator `<font color="#82140F"><code>wordv</code></font>' may be used to extract the words of the
command (see <a href="UnaryOperators.html#UnaryOperators">Unary Operators</a>).
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