Customizing Julia (as in the language) Set

user_888379 0
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I've got an application where Set semantics would be useful for me, but I'm dealing with floating point numbers. I'd like to have a criterion for inclusion in the set that isn't exact equality - that is, if my Set already contains 0.5, I'd like it to ignore 0.50000000000000000018 if there's an attempt to add it. Is there existing machinery that allows this?

julia
1 Answers

As long as you don't need to keep the precision up in the Set, you could use a Set{Float16} or Set{Float32}:

julia> set = Set{Float16}()
Set{Float16}()

julia> push!(set, Float16(2.3))
Set{Float16} with 1 element:
  Float16(2.3)

julia> push!(set, Float16(2.300000001))
Set{Float16} with 1 element:
  Float16(2.3)
user_42828470
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