MATLAB: How to find the sum of product of elements of an array in matlab

Question

hi,

let p = [1 2 33 44 -11 -22] is single row multiple column matrix

i = index of elements of 'p',

in this case i = [1 2 3 4 5 6]

then x = sum(i*p(i)),i.e,'x' is equal to sum of product of corresponding elements of 'i' and 'p';

how to get 'x',

i know that we can compute 'x' by using loops.but is there any better way other than loops.

Answer 1

p = [1 2 33 44 -11 -22]
i = [1 2 3 4 5 6]
out=sum(i.*p(i))