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Results tagged with math
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user 23290
The challenge involves mathematics in some central way. Also consider using more specific tags, listed in the tag wiki info.
1
vote
Simpson diversity index
J, 37 bytes
(1-([:+/]*<:)%+/*[:<:+/)([:+/"1~.=/])
but I believe it can be still shortened.
Example
(1-([:+/]*<:)%+/*[:<:+/)([:+/"1~.=/]) 'AAABBC'
This is just a tacit version of the following f …
- 161
1
vote
The rice and chess problem
J, 17 bytes
A non-tacit solution, by defining a dyad:
f=:4 :'+/y^i.x^2'
e.g.
8x f 2
18446744073709551615
- 161