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August 29, 2015 13:58
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| xs =: (i: 10) % 10 | |
| ys =: (i: 20) % 10 | |
| grid =: ys j./ xs | |
| in =: 4 > | | |
| out =: 1 - in | |
| trim =: (* in) + (_ * out) | |
| iter =: trim @ (+ *:) | |
| require 'viewmat' | |
| viewmat grid iter^:1000 grid |
len =: -/ |. NB. Subtract the right index from the left index by reversing the list and inserting a minus.
Better:
len =: }. - {. NB. Subtract the second from the first
r =: {. + ([: i. len) NB. For (x y) passed in, return the range x + i. len x
(this leaves out the endpoint)
len =: -@- NB. Monadic minus composed with dyadic minus. Usage: x len y
Alternate formulation: [: - - or [: | -
And now you can define
r =: [ + ([: i. len)
which is equal x + the range from 0 to (x len y)
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Grid:
r =: i. % <: NB. Constructs a range of n elements from 0 to 1
g =: [: |: j./ NB. A dyadic function that takes (r x) g (r y) and constructs a 2d grid on [0, 1] * [0, 1]