Getting a vector of block sizes in a particular dimension about blockarrays.jl HOT 6 CLOSED

julia> K = 2; length(axes(X,2)[Block(K)])
1

help?> blocklengths
search: blocklengths blocklength

  blocklengths(a::AbstractUnitRange{Int})

  returns the length of each block of a.

julia> using BlockArrays

julia> X = BlockArray(rand(4, 4), [2,2], [1,1,2])
2×3-blocked 4×4 BlockArray{Float64,2}:
 0.127212  │  0.429535  │  0.803334   0.864513
 0.770943  │  0.307399  │  0.329785   0.373277
 ──────────┼────────────┼─────────────────────
 0.907816  │  0.90384   │  0.734343   0.73693 
 0.37784   │  0.713481  │  0.0596666  0.6767  

julia> blocklengths(axes(X,1))
2-element Array{Int64,1}:
 2
 2

julia> blocklengths(axes(X,2))
3-element Array{Int64,1}:
 1
 1
 2

julia> X = BlockArray(rand(4, 4), [2,2], [1,1,2])
2×3-blocked 4×4 BlockArray{Float64,2}:
 0.711842  │  0.376659  │  0.211663  0.884155
 0.238994  │  0.84558   │  0.622881  0.770471
 ──────────┼────────────┼────────────────────
 0.246592  │  0.651318  │  0.751195  0.981173
 0.297894  │  0.200701  │  0.396812  0.815768

julia> blocksizes(X)
([2, 2], [1, 1, 2])