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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Gri: online help</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></head>
<body bgcolor="#FFFFFF" text="#000000" link="#0000EE" vlink="#551A8B" alink="FF0000">
<!-- newfile OnlineHelp.html "Gri: online help" "Programming Gri" --> 

<!-- @node   Online Help, Long Command Lines, Defaults, Programming -->
<a name="OnlineHelp" ></a>

<img src="./resources/top_banner.gif" alt="navigation map" usemap="#navigate_top" border="0">
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<tr>
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<font size=-1>
<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>
&nbsp;&nbsp;<a href="History.html">13: History</a><br>
&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>
<br>
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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<h2>10.2: Online Help</h2>

Type `<font color="#82140F"><code>help</code></font>' to get a list of available commands and other topics of
interest. Here's how Gri responds
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
<TR>
<TD>
<PRE>
<font color="#82140F">
Type `help' followed by a command-name:
 assert      cd            close         convert
 create      debug         delete        differentiate
 draw        expecting     filter        flip
 get         help          if            ignore
 input       insert        interpolate   list
 ls          mask          move          new
 open        pwd           query         quit
 read        regress       reorder       rescale
 resize      return        rewind        set
 show        skip          sleep         smooth
 source      sprintf       state         superuser
 system      write
Or type `help -' followed by a topic from this list:
 example     extending     files         math
 strings     synonyms      variables     manual
</font></PRE>
</TD>
</TR>
</TABLE>
<p>
Some commands have more words than shown.  You can type these additional
words to narrow the help down; otherwise Gri will give you help
on all commands that begin with the indicated words.  For example, try
`<font color="#82140F"><code>help set</code></font>' and `<font color="#82140F"><code>help set x</code></font>'.  When you ask for help on a
multi-word command, Gri tells you about all commands which begin
with the words you've typed.  Thus,
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
<TR>
<TD>
<PRE>
<font color="#82140F">
help
help draw
help draw zero
help draw zero line
</font></PRE>
</TD>
</TR>
</TABLE>
<p>
 
narrow in on the command `<font color="#82140F"><code>draw zero line</code></font>'.  The response to the
most complete request is
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
<TR>
<TD>
<PRE>
<font color="#82140F">
`draw zero line [horizontally|vertically]'
  draw zero line
    Draw line y=0 if it is within axes
  draw zero line horizontally
    Draw line y=0 if it is within axes
  draw zero line vertically
    Draw line x=0 if it is within axes
</font></PRE>
</TD>
</TR>
</TABLE>
<p>
The part enclosed in angled quotes is the syntactical description of the
command.  (NOTE: The square brackets indicate an optional word (in this
case) or words.  The vertical bar indicates that either the item on the
left or the item on the right may appear; it is a logical OR operator.
The only other special characters in syntax descriptions are the braces
`<font color="#82140F"><code>{}</code></font>', which are used to enclose multiple words which act as one
unit; they are used to clarify the choices presented to the OR
operator.)  Following the syntactical description are examples.  Each
example is indented 2 spaces, and a description of it (which always
starts with an upper-case character and ends with a period, to indicate
that it is an English description) follows that, indented by an
additional 2 spaces.
<p>

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