How do i declare capital pi in this equation

I'm trying to plot a graph of this equation in the image i need help to declare the capital pi expression in the image shown, how do i declare 'e' i only know that the value of k^(i,g) is >= 0. another thing i dont get is if i should provide some value to (f)d or not. can anyone help with this

Answer 1

[Image Analyst]

Use the prod() function.

Answer 2

[Walter Roberson]

e to a power is exp()

I suspect that k with raised (i, g) is indicating indexing.

The capital π represents product.

It is not obvious to me why they did not write the function as exp of the sum of the components

The notation is ambiguous as to whether f is a function of L, or is a numeric value.