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Monadic & (where)
Returns integer vector of true positions in boolean vectors.
Syntax: &x; where x; &[x]; where [x]
o)&0101b
1 3
o)&(1>-1 0 1)
0 1
o)
When applied to integer vector, generates N indices of corresponding elements.
o)&1 2 3
0 1 1 2 2 2
o)where 2 3 0 1
0 0 1 1 1 3
o)