A more elaborate example:
julia> y = [1,2]
2-element Array{Int64,1}:
1
2
julia> [(y = float64(y); y[i]) for i = 1:2]
2-element Array{Any,1}:
1.0
2.0
When your code is inside a function, julia will analyze it and determine that
the type isn't changing.
--Tim
On Thursday, April 17, 2014 07:56:28 AM John Myles White wrote:
> y = [1]
>
> y = [1.0]
>
> [y[1] for i = 1]
>
> On Apr 17, 2014, at 7:44 AM, Paweł Biernat <[email protected]> wrote:
> > Can you elaborate on that? How can you change the type of y in my
> > example?
> >
> > W dniu czwartek, 17 kwietnia 2014 16:38:48 UTC+2 użytkownik John Myles
> > White napisał: Because list comprehensions in the global scope can't be
> > sure that you aren't changing the type of y along the way.>
> > -- John
> >
> > On Apr 17, 2014, at 7:37 AM, Paweł Biernat <[email protected]> wrote:
> >> Could someone please explain to me the difference between the two cases?
> >>
> >> julia> y=[1]
> >>
> >> 1-element Array{Int64,1}:
> >> 1
> >>
> >> julia> [y[1] for i=1]
> >>
> >> 1-element Array{Any,1}:
> >> 1
> >>
> >> julia> [y[1]]
> >>
> >> 1-element Array{Int64,1}:
> >> 1
> >>
> >> In particular, why is in the first case the element type is Any, but in
> >> the second case it is Int64?
