Hi - complete newbie to J here. Though I like what I've seen so far.
Here's my starter question:
I'd like to code the function that gives the inverse of a sum of
inverses (eg. like when calculating resistors in parallel)
It works fine if I just write it out as
% +/ % 10 20 40 (ans 5.71429)
However, if I try to make a function of it,
invsuminv =. % +/ %
it becomes a fork (I guess that _does_ make sense), and just computes
the "cross-sum" of the inverses, as if I'd typed
(% +/ %) 10 20 40
0.2 0.15 0.125
0.15 0.1 0.075
0.125 0.075 0.05
How can I avoid this? I've tried all sorts of combinations, using @ and
& but can't seem to crack it. Obviously something fundamental I'm not
grasping. Any help appreciated.
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