langreiter.com plain, simple: A+

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A+

CREATED BY chris • LAST EDITED BY chris 7333 days AGO

A and A+ are the predecessors of K.

"A is best described as a reduced instruction set APL. It was designed and developed by Arthur Whitney around 10 years ago [in 2001] as a super-fast engine for manipulating timeseries data. It was subsequently developed as A+ by Morgan Stanley and has now been placed into the public domain under the GNU public licence."

The + in A+ signifies the addition of a high-performance GUI component:

"Incredibly, Morgan Stanley wrote a replacement for Motif in 3 months, which can be directly accessed from A. [...]. There is only one copy in memory of the data on screen, and nothing has to be swapped backwards and forwards between the Windows and A+. We were given a staggering demonstration of a window displaying a huge matrix, I cannot remember now if it was 10 million or 1000 million integers. Scrolling around this monster and popping in changes was just as quick as looking at a tiny matrix."