Jaccard index: Difference between revisions
Created Nim solution.
Drkameleon (talk | contribs) (added Arturo) |
(Created Nim solution.) |
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[8] [2, 3, 5, 7] 0/1
[8] [8] 1/1
</pre>
=={{header|Nim}}==
<syntaxhighlight lang="Nim">import std/[rationals, strformat]
type Set8 = set[int8]
const
A: Set8 = {}
B: Set8 = {1, 2, 3, 4, 5}
C: Set8 = {1, 3, 5, 7, 9}
D: Set8 = {2, 4, 6, 8, 10}
E: Set8 = {2, 3, 5, 7}
F: Set8 = {8}
List = [('A', A), ('B', B), ('C', C), ('D', D), ('E', E), ('F', F)]
func J(a, b: Set8): Rational[int] =
## Return the Jaccard index.
## Return 1 if both sets are empty.
let card1 = card(a * b)
let card2 = card(a + b)
result = if card1 == card2: 1 // 1 else: card1 // card2
for i in 0..List.high:
let (name1, set1) = List[i]
for j in i..List.high:
let (name2, set2) = List[j]
echo &"J({name1}, {name2}) = {J(set1, set2)}"
if i != j:
echo &"J({name2}, {name1}) = {J(set2, set1)}"
</syntaxhighlight>
{{out}}
<pre>J(A, A) = 1/1
J(A, B) = 0/1
J(B, A) = 0/1
J(A, C) = 0/1
J(C, A) = 0/1
J(A, D) = 0/1
J(D, A) = 0/1
J(A, E) = 0/1
J(E, A) = 0/1
J(A, F) = 0/1
J(F, A) = 0/1
J(B, B) = 1/1
J(B, C) = 3/7
J(C, B) = 3/7
J(B, D) = 1/4
J(D, B) = 1/4
J(B, E) = 1/2
J(E, B) = 1/2
J(B, F) = 0/1
J(F, B) = 0/1
J(C, C) = 1/1
J(C, D) = 0/1
J(D, C) = 0/1
J(C, E) = 1/2
J(E, C) = 1/2
J(C, F) = 0/1
J(F, C) = 0/1
J(D, D) = 1/1
J(D, E) = 1/8
J(E, D) = 1/8
J(D, F) = 1/5
J(F, D) = 1/5
J(E, E) = 1/1
J(E, F) = 0/1
J(F, E) = 0/1
J(F, F) = 1/1
</pre>
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