D4: An Array Programming Language
Most of these pages have been written up on a 386 SX machine with 640Kb
of memory. When a link is changed on the site, systematic updates may
be automatically made to all the htm files by means of a 'sed' like
editor built into D4, a DOS program. D4 is a dialect of APL which has
been used in health care applications. APL itself was originally
invented by K. Iverson for economic modelling.
The program is available free from the ftp section of this site.
Source code is included. The must recent version is the 16-bit DOS version,
but there is also an older version which compiles on Sun OS. Best is the
LINUX version.
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Windows 95 Installation script
D4 help file
D4 Definition file
Load D4 files