I think this is a limitation of list comprehensions:
julia> [(i,j) for i=1:3, j=1:i]
ERROR: i not defined
in anonymous at no file
but doing the loop works:
julia> for i=1:3, j=1:i
@show i,j
end
(i,j) => (1,1)
(i,j) => (2,1)
(i,j) => (2,2)
(i,j) => (3,1)
(i,j) => (3,2)
(i,j) => (3,3)
Maybe you could check whether there is an issue about this already and
if not file one?
On Mon, 2015-09-21 at 10:37, Alan Crawford <[email protected]> wrote:
> Thanks Tomas. If I do:
>
> Y = [Array(Int64,n) for n in map(k -> binomial(J,k), 1:K)]
>
> Then Y[1] gives the desired result (i.e. Y[1][k] is a length 1 vector).
> However, the issue for Y[2] and above. For example, if I do Y[2][k] where
> k∈[1,binomial(J,2)]
> then i get a length 1 vector, whereas I would like length 2 vector. Similarly
> for Y[3][k] I would like a length 3 vector.
>
>
> On Monday, 21 September 2015 09:23:56 UTC+1, Tomas Lycken wrote:
>
>
> Ah.
>
> Maybe [Array(Int64,n) for n in map(k -> binomial(J,k), 1:K)] is what
> you’re
> looking for?
>
> // T
>
> On Monday, September 21, 2015 at 10:18:31 AM UTC+2, Alan Crawford wrote:
>
> The lower case k is intentional. I didn't want such a 'large' array as
> the one created when I use K because large parts of that array would
> be
> redundant. Ideally, I want this array to be as small as possible,
> especially since J and K might be quite a bit larger than in the
> example.
>
> On Monday, 21 September 2015 09:13:53 UTC+1, Tomas Lycken wrote:
>
>
> Are you sure that’s not just a typo between k and K (note the case
> difference)?
>
> This works for me:
>
> J=10
> K=3
> MyArray = [Array(Int64,k) for k in 1:K, n in 1:binomial(J,K)]
>
> // T
>
> On Monday, September 21, 2015 at 10:08:13 AM UTC+2, Alan Crawford
> wrote:
>
> Hi,
>
> I'd like to be able to define an array of vectors where the
> number of vectors in the array is linked to the length of the
> vector. For example, I want to be define an array with say 10
> scalars, 45 length 2 vectors, 120 length 3 vectors, .... and
> so
> on. Intuitively, I thought the following code might achieve
> this:
>
> J=10
> K=3
> MyArray = [Array(Int64,k) for k in 1:K, n in 1:binomial(J,k)]
>
>
> However, it seems i cannot use kto define the number of
> element indexed by n.
>
> I was wondering if anyone knew how to create the desired
> array?
>
> Thanks
> Alan
>
>
>
>
