Maybe this is what you want
[y[:,1:2] hcat([y[:,j] for j=2:3]...)]
2014-04-02 8:53 GMT-04:00 Paweł Biernat <pawel.bier...@gmail.com>:
>
> Hi,
> I am trying to construct a matrix (2d array) via the array comprehension
and hcat like this
>
> y=[1 for i=1:3, j=1:3]
> yy=hcat(y[:,1:2],[y[:,j] for j=2:3])
>
> which fails with the following message
>
> ERROR: mismatch in dimension 1
> in cat_t at abstractarray.jl:680
> in hcat at abstractarray.jl:719
> in anonymous at no file
>
> I understand, that this message is caused by the difference in types
>
> julia> typeof(y[:,1:2])
> Array{Int64,2}
>
> julia> typeof([y[:,j] for j=2:3])
> Array{Any,1}
>
>
> How can I inform Julia of that fact that the result of array
comprehension is a 2d array? I tried to add some assertion to the list
comprehension like this
> hcat(y[:,1:2],Array{Int64,1}[y[:,j] for j=2:3])
>
> but it still doesn't work.
>
> Alternatively, is there any other way to prepend/append/insert a
column/row to the matrix y?
--
Med venlig hilsen
Andreas Noack Jensen
