No methods for parse(ComplexN, "")

[ethomag]

julia> parse(Complex128, "1.0+1.0im")
ERROR: MethodError: no method matching parse(::Type{Complex{Float64}}, ::String)

However, I can do:

julia> eval(parse("1.0+1.0im"))
1.0 + 1.0im
julia> typeof(ans)
Complex{Float64}

But, a bit awkward and will not give me immediate control of the resulting type.

Another - not related - strange thing which I've noticed with Complex is:

julia> one(im)
Complex(true,false)
julia> one(0+1im)
1 + 0im

julia> versioninfo()
Julia Version 0.6.1
Commit 0d7248e (2017-10-24 22:15 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Xeon(R) CPU E5-2680 v4@ 2.40GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, broadwell)

[fredrikekre]

First thing is duplicate of #22250

Another - not related - strange thing

What is strange about it?

[ethomag]

First thing.
My apologies. Tried to search for a related issue, but could not find any. Thanks for pointing it out!

Second thing. I was just surprised by the result. I probably don't understand the subtle nuancies of the parsing of complex numbers or the Julia types. What surprises is:

Julias> typeof(im)
Complex{Bool}
Julias> typeof(1im)
Complex{Int64}

No issue here, just thought I spotted something previosly overlooked.

[ethomag]

Since the only real issue was already reported and the second "issue" was not much of an issue. I close this.

[fredrikekre]

No worries.

typeof(1im)

Here we multiply an Int (1) with Bools (the true, and false inside im) so therefore the result is of type Int