Summation of certain range of entries/numbers from a large array

Can you please help me with another query : Suppose I have a large array of numbers , about 2807 entries eg A=(....0 3 4 5 7 8 9 5 5 7 8 9 0 4 1 4 5 7 8 .....) Now I wanna compute sum of certain numbers ,eg from 1500th entry to 1901th entry , likewise summation of other ranges ! How can I do that , kindly elaborate !This is required to develop an algorithm!

Answer 1

[Riccardo Scorretti]

Hi Raashid,

if you know the range over which you need to compute the sum, it is enough to do like that:

A = rand(2807, 1);
partial_sum = sum(A(1500:1901))

partial_sum = 198.3952