Thanks. Though its more this ::Type{Complex{T<:Real}} that is confusing
me.. what does it mean? Is ::Type{} casting a Complex number? So do you
then have to say something like Complex(self, realpart, imagpart)?
On Tuesday, 22 December 2015 16:27:36 UTC+2, Jeffrey Sarnoff wrote:
>
> Think of Complex as complex number factory. As with any factory, this one
> takes in some raw material, one or two numbers that are some subtype of
> Real, and produces its product -- a Complex number.
> And this makes sense mathematically; Real numbers are 'real number part'
> of Complex numbers, so we expect Complex(5) to be the Complex number with a
> real number part of 5 and an imaginary number part of 0:
>
> julia> Complex(5)
> 5 + 0im
>
> Using two Real numbers, one for real part of the Complex number and the
> other for imaginary part also makes sense because once we isolate the real
> and imaginary parts, this happens:
>
> julia> a = Complex(5,4); a, typeof(a)
> 5 + 4im, Complex{Int64} # or Complex{Int32}, depending on your system
> julia> firstnumber,secondnumber = a.re, a.im
> (5,4)
> julia> typeof(firstnumber), typeof(secondnumber)
> Int64, Int64
>
> and Integers are a subtype of Real
> Try the same steps using 5.0 and 4.0
>
>
>
>
>
> On Tuesday, December 22, 2015 at 7:49:19 AM UTC-5, kleinsplash wrote:
>>
>> Hi,
>>
>>
>> I am working through a tutorial and have come across this line:
>>
>>
>> call{T<:Real}(::Type{Complex{T<:Real}}, re::T<:Real, im::T<:Real) at
>> complex.jl:4
>>
>> when running:
>>
>>
>> methods(Complex)
>>
>> I think it says:
>>
>>
>> when calling Complex() you can provide two inputs either a value T which
>> must be a subtype of type abstract type Real OR ??
>>
>>
>> So an example would be:
>>
>>
>> Complex(10) or Complex(5,1)
>>
>>
>> Is this correct?
>>
>>
>> -Thank you
>>
>>
