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gri - scientific graphics language


gri [ OPTIONS ] [ CommandFile [ optional_arguments ]]


Gri is a programming language for scientific graphics. It can make x-y graphs, contour-
graphs, and image graphs. In addition, Gri has a full suite of low-level graphical
elements and sufficient programming capabilities (loops, subroutines, etc) to permit
complex customization.

Gri is not point-click. In some ways it is analogous to TeX. Extensive power rewards
tolerance of a modest learning curve.


If a command file (CommandFile) is named, commands are read from that file; otherwise they
are read from the keyboard. If a command file is named, then a file in which to store the
PostScript output may also be named; otherwise it is stored in a file named by
substituting the .ps extension instead of .gri in CommandFile. If no command file is
named, the output is named gri-00.ps (or gri-01.ps if gri-00.ps exists, etc).

There are 3 special forms that do no graphing:

`gri -creator postscript_file'

Extracts the Gri commands that created the Gri PostScript file.

`gri -help' or `gri -h'

Prints this help message.

`gri -version' or `gri -v'

Prints the version number of Gri.

In normal usage, where drawing is expected, Gri takes these options:

-batch or -b

Stops printing of prompts and hints.

-chatty[N] or -c[N]

Let gri print info messages

-debug or -d

Turns debugging on (sets variable ..debug.. to value 1).


Warn if any item is drawn far off a 8.5x11 inch page. (This is the default.)


Don't warn if any item is drawn far off a 8.5x11 inch page

-directory pathname

Specifies the directory where Gri looks for startup files; otherwise it looks in
/opt/gri/lib or at whatever directory is defined in configure shellscript, at
compile time.


Reports directory where gri.cmd should be found, if not supplied by -directory.


Make bounding-box be full page.


Prevent warning message if `expecting version .n.' command is missing.


Stops printing of startup message.

-publication or -p

Sets the builtin variable ..publication.. to 1; normally it is 0. One might use if
statements (`if !..publication..' ...) on drafts.

-superuser or -s

Used only by Gri programmers (who can check the value with the C function
`superuser()'.) An optional value can be supplied without spaces (e.g. `-s2') to
set the debugging level. Flags are listed below; add flags to get several actions
at once

1: print cmdline before/after substituting synonyms

2: print cmdline before/after substituting rpn expressions

4: print new commands being defined

8: print system commands and `open "... | "' commands before

they are passed to the system

128: for author's use only

256: for author's use only

Note that all flags are equal to 2 raised to an integer power. Since the flag
values are detected by a bitwise OR, you can combine flags by adding; thus
specifying a flag of 5 yields flags 1 and 4 together; specifying 15 yields flags 1,
2, 4 and 8.

-trace or -t

Makes Gri print out command lines as they are executed.

-true or -y

Makes Gri think the answer to all `query's is RETURN.

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