Extracting a specific subarray in Julia -

from array

[3,1,7,2; 4,3,2,7; 3,4,1,2] 

i extract subarray corresponding rows having last entree equal 2.

i matlab user trying start using julia. looked hint in docs failed find working answer.

thank in advance,

stephane

does work you?

julia> x = [3 1 7 2             4 3 2 7             3 4 1 2] 3x4 array{int64,2}:  3  1  7  2  4  3  2  7  3  4  1  2  julia> x[x[:, end] .== 2, :] 2x4 array{int64,2}:  3  1  7  2  3  4  1  2 

let's break down.

x[:, end] last column.

x[:, end] .== 2 gives vector{bool} (1d array of true , false), have true if row ends in 2 , false otherwise.

then putting have x[x[:, end] .== 2, :], takes vector of true , false specify rows , ,: says take columns in each of rows.