Re:The J Programming Language [video]
by ProfVitzli on Monday March 31, 2014 @06:19AM
(#7500569)
I think everybody who is using APL would have good reasons to use J (which is actually APL's successor and was also created by Ken Iverson). If one is interested in these kind of languages, he should definitely also check out Arthur Whitney's magnificent K and Q (https://en.wikipedia.org/wiki/K_%28programming_language%29).
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If you want to try out q there's a similar video available for it here:
http://www.timestored.com/kdb-guides/getting-started-kdb
q isn't open source but it is widely used by most major banks to analyse their time series data and there are very well paying and interesting jobs available.