Question

I have two lists of double values which have the same length.

Is it possible to go through both lists by using a select statement and return the mean value of the difference between the elements from the same position?

Example :
{1 2 3 4}

{1 1 1 1}

I want to return ( (1 - 1) + (2 - 1) + (3 - 1) + (4 - 1) ) / 4 = 6 / 4 = 1.5

Answer 1

Try

listA.Zip(listB, (a, b) => a - b).Average();

Without .NET 4.0 and Zip, try

listA.Select((n, index) => n - listB[index]).Average()