See http://julia.readthedocs.org/en/latest/manual/arrays/#indexing
For example:
julia> x = [i * j for i in 1:3, j in 1:5]
3x5 Array{Int64,2}:
1 2 3 4 5
2 4 6 8 10
3 6 9 12 15
All rows, first two columns:
julia> x[:, 1:2]
3x2 Array{Int64,2}:
1 2
2 4
3 6
First 2 rows, 2nd and 4th column:
julia> x[1:2, [2,4]]
2x2 Array{Int64,2}:
2 4
4 8
On Tuesday, June 10, 2014 5:46:33 PM UTC-7, Zahirul ALAM wrote:
>
> I have a simple question: How do I select all columns or particular
> columns from a matrix. it is very straightforward to select a row. I have
> been struggling for the last two hours. how do I do this? the manual does
> not seem to talk about it. or am I missing it?
>
