summation of equation in matlab

I have an equation

S(i)*(P-C(i))

I want to perform summation operation such that

where n can be n=2 ,3 ,4....

please tell me what will be the approached???

[Niharika Nayak]

It works thanks ?

Answer 1

[Walter Roberson]

sum(S(1:n) .* (P - C(1:n)))

In the case where n is the same as the size of S and C then this can be simplified to

sum(S .* (P - C))

[Wisal Adnan]

I want to perform summation operation such that

where n can be n=2 ,3 ,4.... where i start from 1 to 2n

please tell me what will solution?