sparse(eye(1000)) hangs on windows

[quinnj]

I didn't find any other issues about this.

Some digging seems to point to the constructor. Are there some parameters not being satisfied?

In  [10]: m,n = 1000, 1000

Out [10]: (1000,1000)

In  [11]: colptr = ones(Int,1000);

In  [12]: I = ones(Int,1000);

In  [13]: V = ones(1000);

In  [14]: @which SparseMatrixCSC(m, n, colptr, I, V)

Out [14]: SparseMatrixCSC{Tv,Ti<:Integer}(m::Int64,n::Int64,colptr::Array{Ti<:Integer,1},rowval::Array{Ti<:Integer,1},nzval::Array{Tv,1})

It's weird that @which can't find a line number for the constructor.

[quinnj]

cc: @ViralBShah @tanmaykm

[dmbates]

Your vectors don't satisfy the conditions of a SparseMatrixCSC object.
colptr should have length n + 1 and length of V should be colptr[n + 1] - 1.

[quinnj]

So why does sparse(eye(1000)) hang? Is something not being calculated right?

[dmbates]

Don't know. I can't reproduce the problem on Linux.

julia> I1000 = sparse(eye(1000));

julia> names(I1000)
5-element Array{Symbol,1}:
 :m     
 :n     
 :colptr
 :rowval
 :nzval 

julia> println(I1000.m, " ", I1000.n)
1000 1000

julia> I1000.colptr'
1x1001 Array{Int64,2}:
 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  …  993  994  995  996  997  998  999  1000  1001

julia> I1000.rowval'
1x1000 Array{Int64,2}:
 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  …  992  993  994  995  996  997  998  999  1000

julia> I1000.nzval'
1x1000 Array{Float64,2}:
 1.0  1.0  1.0  1.0  1.0  1.0  1.0  1.0  1.0  1.0  …  1.0  1.0  1.0  1.0  1.0  1.0  1.0  1.0  1.0  1.0

[quinnj]

Hmmm.......seems to be a weird bug in trying to show the sparse matrix. I've tracked it down to

print(io, sep, '[', rpad(S.rowval[k], pad), ", ", lpad(col, pad), "]  =  ")

here

[quinnj]

Ok, even further reduced case:

io = STDOUT
sep = "\n\t"
print(io, sep)

Calling print hangs.

[quinnj]

Further investigation takes me to https://github.com/JuliaLang/julia/blob/master/base/stream.jl#L765 trying to write(STDOUT,'\t'). @Keno, @vtjnash any ideas?

[quinnj]

Is this related to #7082 perhaps?

[stevengj]

Related to JuliaLang/IJulia.jl#200?

[quinnj]

Ah, I didn't see that. Yes, it looks like it's the same issue (I don't see the same problem from console, only Sublime-IJulia). So I'm confused, is this a Julia or IJulia issue?

[stevengj]

I'm not sure where the problem lies; I haven't been able to reproduce the problem (on MacOS).

(With IPython, it is not hanging, but somehow some garbled control characters are apparently being sent.)

[stevengj]

The problem seems to be that JSON.jl is not escaping the tab character on Windows because isprint('\t') returns true on Windows (and false on MacOS).

I'm not sure whether this is a bug in JSON or in isprint; see #7416.

[stevengj]

Should be worked around by JuliaIO/JSON.jl@0f038d9