How to convert Func

I am trying to convert Func<MathNet.Numerics.LinearAlgebra.Vector<double>, double> to Func<double[], double>, but couldn't find a way.

The reason I need to do is: I get an argument in the first form and I have to pass it in the second form. Basically, I have to map each double value in a Vector to a double value in a double array.

Is there a way to do this conversion, perhaps with reflection?