`im` as global constant

kurt · July 11, 2022, 3:18pm

Where is im as a global constant defined?
I’ve checked base.jl, complex.jl and mathconsts.jl. I cant seem to find it.
Help would be appreciated. Thank you

baggepinnen · July 11, 2022, 3:20pm

github.com

JuliaLang/julia/blob/master/base/complex.jl#L36


      
          
          
# Examples
          ```jldoctest
          julia> im * im
          -1 + 0im
          
          
julia> (2.0 + 3im)^2
          -5.0 + 12.0im
          ```
          """
          const im = Complex(false, true)
          
          
const ComplexF64  = Complex{Float64}
          const ComplexF32  = Complex{Float32}
          const ComplexF16  = Complex{Float16}
          
          
Complex{T}(x::Real) where {T<:Real} = Complex{T}(x,0)
          Complex{T}(z::Complex) where {T<:Real} = Complex{T}(real(z),imag(z))
          (::Type{T})(z::Complex) where {T<:Real} =
              isreal(z) ? T(real(z))::T : throw(InexactError(nameof(T), T, z))

kurt · July 11, 2022, 3:22pm

Ah Ah! Thank you.