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emchateau/pairsCombinations.xq

Last active June 12, 2020 21:46
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pairs combinations in a sequence with XQuery
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pairsCombinations.xq
xquery version "3.1" ;
(:~
: Pairs combinations in a sequence
: Unique pairs in a sequence (where order is irrelevant)
:)
let $seq := ("a", "b", "b", "d")
for $i at $pos in $seq
for $j in fn:subsequence($seq, $pos+1, fn:count($seq))
return <result>{$i, $j}</result>
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 .   1,2  1,3  1,4
 .    .   2,3  2,4
 .    .    .   3,4
 .    .    .    .

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