I think this will be work:
julia> r = ones(5, 5)
5x5 Array{Float64,2}:
1.0 1.0 1.0 1.0 1.0
1.0 1.0 1.0 1.0 1.0
1.0 1.0 1.0 1.0 1.0
1.0 1.0 1.0 1.0 1.0
1.0 1.0 1.0 1.0 1.0
julia> pos = [3, 4]
2-element Array{Int64,1}:
3
4
julia> r[pos...]
1.0
— John
On Feb 17, 2014, at 4:58 PM, David P. Sanders <[email protected]> wrote:
>
>
>
> El lunes, 17 de febrero de 2014 18:57:10 UTC-6, David P. Sanders escribió:
> Hi,
>
> Suppose I have the following:
>
> r = rand(5, 5)
>
> I can select a single element of the array r using
>
> r[3, 4]
>
> Now suppose that I have the position [3, 4] stored in a variable as
>
> pos = [3, 4]
>
> How can I use pos as the index for selecting the *single* element r[3, 4]?
>
> Of course, one solution is
>
> r[pos[1], pos[2]]
>
> but this is not suitable for a multi-dimensional array.
>
>
>
> I would like to do r[pos], but this returns a *two*-element array, given by
> the elements numbered 3 and 4 in the linear ordering of the array r.
>
> This sounds like a silly question, but I can't find the answer!
>
>
> Thanks,
> David.
