Remove explicit zero values from sparse matrix in Julia

Question

Is it possible to remove explicit zero value from sparse matrix in Julia?

Namely, I want to convert a=sparse([1],[1],[0]) into b=spzeros(1,1)

Answer 1

Yes: see dropzeros:

julia> a=sparse([1],[1],[0])
1×1 SparseMatrixCSC{Int64,Int64} with 1 stored entry:
  [1, 1]  =  0

julia> dropzeros(a)
1×1 SparseMatrixCSC{Int64,Int64} with 0 stored entries

Or you can do it in place (modifying a) with dropzeros!.