How to fix that when sparse arrays are getting to big, the elements aren't shown anymore?

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When I want to print large sparse arrays in Julia, the elements of the sparse array aren't shown. The only things that are printed, are dots on the position in the array where the elements aren't equal zero. E.g:

julia> sparse(I,16,16)
16×16 SparseMatrixCSC{Bool, Int64} with 16 stored entries:
⠑⢄⠀⠀⠀⠀⠀⠀
⠀⠀⠑⢄⠀⠀⠀⠀
⠀⠀⠀⠀⠑⢄⠀⠀
⠀⠀⠀⠀⠀⠀⠑⢄

For small arrays it works fine.

julia> sparse([1 0 ; 0 1])
2×2 SparseMatrixCSC{Int64, Int64} with 2 stored entries:
 1  ⋅
 ⋅  1

This problem only occurs when I am on Windows. On Linux it gets printed out with the specific elements shown correctly even if the array gets big. Like this:

julia> sparse([1.0, 0.0, 1.0])
3-element SparseVector{Float64, Int64} with 2 stored entries:
  [1]  =  1.0
  [3]  =  1.0

Is there a way to fix this?

julia sparse-matrix windows
1 Answers

I would just materialize the sparse array when wanting to display it:

julia> Matrix(sparse(I,16,16))
16×16 Matrix{Bool}:
 1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
 0  1  0  0  0  0  0  0  0  0  0  0  0  0  0  0
 0  0  1  0  0  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  1  0  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  1  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  1  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  1  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  1  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  1  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  1  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  1  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  1  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  0  1  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  0  0  1  0
 0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  1

But what you perhaps wanted is Base.print_matrix:

julia> Base.print_matrix(stdout, sparse(2I,18,18))
 2  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅
 ⋅  2  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅
 ⋅  ⋅  2  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅
 ⋅  ⋅  ⋅  2  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅  ⋅
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