On Fri, Oct 16, 2015 at 10:23 AM, Tomas Lycken <[email protected]> wrote:
> If you execute this in a function, or in a script file, this won’t happen.
>
> The problem when doing it in the REPL is that Julia can’t know what you will
> do with the list variable in the future, so it has to be very defensive with
> type inference, to avoid having to throw nasty type errors later.
The issue is related to type inference in global scope but,
1. Putting in a script won't help because it's still in the global scope
2. The issue isn't about future use of list, is't about `M`. Julia
have no way to garentee that the type of M is always constant when
it's using it (yes, in this case it doesn't change but the compiler
cannot know that before running your code)
3. const M = 10 should work
4. putting this in a function should also work
5. There's also discussion about type-inference-free comprehensions.
>
> // T
>
> On Friday, October 16, 2015 at 4:19:54 PM UTC+2, Thuener Silva wrote:
>>
>> I want to create an array of arrays of int64. But sometimes the type
>> change to Any, why? It is a bug?
>>
>> julia> M = 10
>> julia> typeof(M)
>> Int64
>>
>> julia> list = [[i] for i=1:M]
>> 10-element Array{Any,1}:
>> [1]
>> [2]
>> [3]
>> [4]
>> [5]
>> [6]
>> [7]
>> [8]
>> [9]
>> [10]
>>
>> list = [[i] for i=1:10]
>> 10-element Array{Array{Int64,1},1}:
>> [1]
>> [2]
>> [3]
>> [4]
>> [5]
>> [6]
>> [7]
>> [8]
>> [9]
>> [10]
>>
>> Grats,
>> Thuener Silva
>>
>
