gistfile1.txt

for col in 1:n
  for idx in colptr[i]:colptr[i]-1
     row = rowval[idx]
     nzv = nzvals[idx]
     if row==col && nzv
       return true
     elseif row>col
       break
     end
  end
end
return false

function has_self_loop(g::SimpleSparseGraph)
   n = g.fm
   colptr = g.fm.colptr
   rowval = g.fm.rowval 
   nzval = g.fm.nzval
   @inbounds for col in 1:n
        for idx in colptr[col]:colptr[col+1]-1
            row = rowval[idx]
            nzv = nzval[idx]
            if row == col && nzv
                return true
            elseif row > col
                break
            end
        end
    end
    return false
end