where

Description

@where(x)

• return the indices of elements which point to the 'true' values in x

Type Rules

bool -> i64
_    -> domain error

Extension

(Deprecated) Treat a list<bool> as a boolean matrix, then return two vectors which contain the x- and y-index of true values separately.

Examples

    @where((1,0,1,0):bool)
(0,2):i64