Quote about motivations behind J, found in Kenneth E. Iverson's Wikipedia page: """ When I retired from paid employment, I turned my attention back to this ma

Quote about motivations behind J, found in Kenneth E. Iverson's Wikipedia page: """ When I retired from paid employment, I turned my attention back to this matter [the use of APL for teaching] and soon concluded that the essential tool required was a dialect of APL that: • Is available as "shareware", and is inexpensive enough to be acquired by students as well as by schools • Can be printed on standard printers • Runs on a wide variety of computers • Provides the simplicity and the generality of the latest thinking in APL The result has been J, first reported in [the APL 90 Conference Proceedings] """ This is how you'd compute a moving average (taken from its Wikipedia page [0]): avg=: +/ % # avg 1 2 3 4 2.5 v=: ?. 20 $100 NB. a random vector v 46 55 79 52 54 39 60 57 60 94 46 78 13 18 51 92 78 60 90 62 avg v 59.2 4 avg\ v NB. moving average on periods of size 4 58 60 56 51.25 52.5 54 67.75 64.25 69.5 57.75 38.75 40 43.5 59.75 70.25 80 72.5 Pretty cool. [0] https://en.wikipedia.org/wiki/J_(programming_language) https://en.wikipedia.org/wiki/J_(programming_language)