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<br>
Chapters:
</br>
<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>
<br>
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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<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>
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<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>
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<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,
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<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
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<PRE>
<font color="#82140F">
help
help draw
help draw zero
help draw zero line
</font></PRE>
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<p>
narrow in on the command `<font color="#82140F"><code>draw zero line</code></font>'. The response to the
most complete request is
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<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>
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<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.
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