Source
incanter/core.clj:1057
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(defn length
" A version of count that works on collections, matrices, and numbers.
The length of a number is one, the length of a collection is its count
and the length of a matrix is the number of elements it contains (nrow*ncol).
Equivalent to R's length function.
"
([coll]
(cond
(number? coll)
1
(matrix? coll)
(* (.rows ^Matrix coll) (.columns ^Matrix coll))
(coll? coll)
(count coll)
:else
1)))
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