Cannot open .mtx files from Network Data Repository (networkrepository.com). Not a valid header

[joseortiz3]

I cannot open any .mtx files from the Network Data Repository. Not sure if it is them providing invalid .mtx files or MatrixMarket.jl not supporting some use-case of the .mtx format.

For instance, the bio-celegans file isn't supported. It looks like:

%MatrixMarket matrix coordinate pattern symmetric
453 453 2025
186 1
207 1
218 1
227 1
228 1
229 1
230 1

MatrixMarket.jl complains:

julia> MatrixMarket.mmread("./networkData/bio-celegans/bio-celegans.mtx")
ERROR: MatrixMarket.ParseError("Not a valid MatrixMarket header:%MatrixMarket matrix coordinate pattern symmetric")
Stacktrace:
 [1] (::MatrixMarket.var"#1#3"{Bool,Bool})(::IOStream) at C:\Users\Joey\.julia\packages\MatrixMarket\ic62N\src\MatrixMarket.jl:38
 [2] #open#271(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::typeof(open), ::MatrixMarket.var"#1#3"{Bool,Bool}, ::String, ::Vararg{String,N} where N) at .\io.jl:298
 [3] open at .\io.jl:296 [inlined]
 [4] mmread at C:\Users\Joey\.julia\packages\MatrixMarket\ic62N\src\MatrixMarket.jl:30 [inlined] (repeats 2 times)
 [5] top-level scope at none:0

[tkonolige]

Matrix market headers must start with %%MatrixMarket, yours has only one %.

[joseortiz3]

Yep. That fixed it. I will relay the formatting problem to networkrepository.com. Thanks.