On Fri, 2014-07-25 at 17:36 -0700, Ross Boylan wrote:
> I think I've narrowed down my previous problem. I have a composite type
> that has members, some of which are arrays. How do I initialize those
> inner arrays properly? Actually, I have an earlier problem: the objects
> aren't being created at all. Here's what I tried (nstep and npop
> previously set):
> julia> type B; i::Vector{Int}; end
>
> julia> B() = B(zeros(Int, nstep))
> B (constructor with 3 methods)
>
> julia> typeof(B)
> DataType
> # but isn't B also the name of a function?
>
> julia> bs = Array(B, npop)
> 4-element Array{B,1}:
> #undef
> #undef
> #undef
> #undef
>
> My hope was that defining what would be a default constructor in C++,
> name B(), would establish the initial values for the vector elements
> bs[i]. It didn't.
>
> How do I create an Array of B's that are properly initialized?
Thanks to John and Kevin for their solutions. I also notice the fine
manual says that Array provides "an uninitialized dense array". Just
below that is another solution (after creating the array):
fill!(A, x) fill the array A with value x
For reference, the other 2 solutions were
bs = Array(B, npop)
for i in 1:npop
bs[i] = B()
end
or
[B() for i=1:npop]
I looked for, but did not find, a method that would create an array out
of a protypical instance.
Ross
