Hello!

Suppose that I would like to write a function y = x_1^2 + x_2^2 + … + x_n^2. How can I integrate a sum operator in my function to sum from i = 1 to n?

Alternatively, if I would like to code y = x_1^2 * x_2^2 *… * x_n^2, how can I integrate the product operator to multiply the squares of x from i = 1 to n?

# Product and sum operator

**Ana814**#1

**stevengj**#2

Use a different data structure and call `sum(x -> x^2, x)`

. If `n`

is small, known at compile-time, and you want the performance of using local variables rather than a heap-allocated array, use the StaticArrays package.