This only lists new features, there are many bugfixes.
* Apply a patch provided Kawamura Masao, relating to (a) errors in
the documentation of file locations and (b) a programming error
hidden behind an unset precompiler flag.
* Add `sed' RPN operator, to work on strings
* Add `skewness' and `kurtosis' RPN operators, to work on columns
* In the documentation, change the names of some variables to be
clearer: `ll_x' is now written `xleft', etc.
* Add RPN binary operators `and', `or' for logical operations,
along with negation operator `not'
* Add `draw arc' command
* Add `set x axis labels' and `set y axis labels' commands.
* Permit specification of `pt' units for `draw label', `draw box',
`draw symbol at', and `draw line from'.
* Add `set clip to curve' command. _Caution:_
this needs extension, and may have a bug if called twice in
succession [but is this with an intervening `set clip off']
* Add `group' and `end group' commands, in preparation for SVG
output. So far these commands do nothing, and are basically just a
signal that users should not create commands with these names
since Gri will need them soon.
* Add `..xinc..' and `..yinc..' builtin variables.
* Make the `open' command accept URLs as filenames.
Gri is a language for scientific graphics applications. By 'language'
I mean that it is a command-driven application, as opposed to a
click/point application. It is analogous to latex or tex, and shares
the property that extensive power is the reward for tolerating a
modest learning curve. Gri output is in industry-standard PostScript,
suitable for incorporation in documents prepared by various text
processors.
Gri can make x-y graphs, contour-graphs, and image graphs. In
addition to high-level capabilities, it has enough low-level
capabilities to allow users to achieve a high degree of customization.
Precise control is extended to all aspects of drawing, including
line-widths, colors, and fonts. Text includes a subset of the tex
language, so that it is easy to incorporate Greek letters and
mathematical symbols in labels.
