I have uploaded the package linear-circuit that computes the resistance of a network of resistors using linear algebra from hmatrix: https://hackage.haskell.org/package/linear-circuit This package also demonstrates the use of a graph structure that is an alternative to fgl: https://hackage.haskell.org/package/comfort-graph The resistance computation is a generalization of a small example for computing the resistance of a cube of resistors: https://hackage.haskell.org/package/resistor-cube