Using "√" with a vector

General Usage
3

The √ is actually a prefix operator (and not just a function name) so you can do things like √2. This means that it gets dotted like all the other operators — with a dot prefix.

julia> .√[1,2,3]
3-element Array{Float64,1}:
 1.0
 1.41421
 1.73205

julia> .![true,false,true]
3-element BitArray{1}:
 false
  true
 false

julia> .-[1,2,3]
3-element Array{Int64,1}:
 -1
 -2
 -3
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