Comprehension vs map and filter unexpected speeds

[stakaz]

Yes, it was just to complete the question fore later users.

[klaff]

@stakaz

julia> @time [a^2 for a ∈ A[A .> 0.5]];

Today I Learned about BitArrays!

[stevengj]

@stakaz

as i should create an additional array whereas the first two don’t.

Note that filter(x -> x > 0.5, A) creates an additional array. If you want the non-allocating version, use Iterators.filter(x -> x > 0.5, A)