On Sunday, November 22, 2015 at 11:22:07 PM UTC+1, Milan Bouchet-Valat
wrote:
>
> Le dimanche 22 novembre 2015 à 14:08 -0800, Martin Kuzma a écrit :
> >
> >
> > Hi, i am new to Julia and i am little bit confused about type
> > conversion.
> > In the docs is written following:
> >
> > When appended to a variable in a statement context, the :: operator
> > means something a bit different: it declares the variable to always
> > have the specified type, like a type declaration in a statically
> > -typed language such as C. Every value assigned to the variable will
> > be converted to the declared type using convert()
> >
> > So I tried a little experiment.
> >
> > a::Array{Cdouble, 2} = [1 2 3;4 5 6] #this throws ERROR: TypeError:
> > typeassert: expected Array{Float64,2}, got Array{Int64,2}
> > in eval at ./boot.jl:263
> >
> > experiment no. 2:
> > convert(Array{Cdouble,2}, [1 2 3;4 5 6]) # this outputs 2x3
> > Array{Float64,2}:
> > 1.0 2.0 3.0
> > 4.0 5.0 6.0
> > So the conversion works.. I thought, that the conversion will be
> > automatic, but it isn't. What am I getting wrong?
> This works only inside of a function, not directly at the REPL. Maybe
> the docs could be clarified.
>
> To be precise, only on local (not global) scope.
