Gri Commands
1: Introduction
2: Simple example
3: Fancy example
4: Running Gri
5: Programming Gri
6: General Issues
7: X-Y Plots
8: Contour Plots
9: Image Plots
10: Examples
11: Handling Data
12: Gri Commands
13: Gri Extras
14: Evolution of Gri
15: Installing Gri
16: Gri Bugs
17: System Tools
18: Acknowledgments
19: License
20: Newsgroup
21: Concept Index
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12.2: Command syntax
The syntax description is enclosed within angled single quotes, optional
items are enclosed in square brackets, multiword items are enclosed in
curly braces, and vertical bars separate different legitimate choices.
For example, the documentation item for the command for drawing contours
`draw contour \
[.value. | \
{.min. .max. .inc. [.inc_unlabelled.]}] \
[unlabelled]'
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indicates that following are legal:
draw contour # gri selects levels
draw contour unlabelled # " but unlabelled
draw contour 10 # single contour line
draw contour 10 unlabelled # " but unlabelled
draw contour 0 100 10 # contours at z=0,1,
draw contour 0 10 1 unlabelled # " but unlabelled
# contours at 0, 0.1, ... labelled at 0, 1
draw contour 0 10 1 0.1
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Note that items enclosed in braces must appear in their entirety; for
example,
draw contour 0 10 # WRONG; missing .inc.
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which might look similar `draw contour .min. .max. .inc. ' to you,
looks like garbage to Gri. Gri will recognize it as an attempt at the
`draw contour ' command (because the first 2 words match the syntax)
but it will then get confused, spit out an error message, and quit.
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