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[alexcweiner]

I find that division by zero usually satisfies some edge condition in practice, as you are usually dealing with lists of numbers in APL, and it doesn't really come up that often.

gnuapl is also FOSS :)

[Zuider → alexcweiner]

But which is preferable 0 or 1? Maybe something in between, or maybe even something surprising like -1/12? Which choice will lead to the least error in the long run?

NARS2000 comes with a pretty IDE.