How to enter an equation with a summation?

I want to enter an equation

Vij = (1/(2*π*ϵ)) ∑ ln(Djk/Dik) where the summation is from k=1 to n

K is the counter, i and j are variables that I will choose later on.

I want the equation to write itself in full form after I define n and the variable names. The result will not be an integer. As I have not defined the values for the D variables yet.

Answer 1

[Roger Wohlwend]

V(i,j) = sum(log(D(i,:)./D(j,:))) / (2*pi*e)