adjacency_matrix: Collect neighbors before sorting them (#71)

* adjacency_matrix: Collect neighbors before sorting them

The neighbors list may be an iterator that is not sortable. Make
sure to collect it first to get an array back.

* change to `sort!`

Co-authored-by: Etienne dg <[email protected]>

Author: Keno

src/linalg/spectral.jl

@@ -59,7 +59,7 @@ function _adjacency_matrix(g::AbstractGraph, T::DataType, neighborfn::Function,
                 nz -= 1
             end
         end
-        dsts = sort(neighborfn(g, j)) # TODO for most graphs it might not be necessary to sort
+        dsts = sort!(collect(neighborfn(g, j))) # TODO for most graphs it might not be necessary to sort
         colpt[j + 1] = colpt[j] + length(dsts)
         append!(rowval, dsts)
     end