Sum the elements of an array by sequence

I have an array 'X' with size 10000.

For the porspose of understanding this problem let's say that my X is

X=[1 4 15 6 7 5 3 2 11 13 1 7 8 13 2 5 9 3 2 11 13 1 7 8 6 7 5 13 5 9] which has 30 elements

Now, I want to add the first 5 elements togather and the second 5 elements togather and the third 5 elements togather and so on.

I want to display the new array on Y

I am not sure how to let matlab do that for me so I do not have sum them manually of use the tedious method such us

Y1=sum(X(1,5))

Y2=sum(X(6,10))

Y2=sum(X(11,15))

.

.

.

.

.

Y6=sum(X(26,30))

So that my

Y=[Y1 Y2 Y3 Y4 Y5 Y6]

Can you help me on this please

Answer 1

[Walter Roberson]

X=[1 4 15 6 7 5 3 2 11 13 1 7 8 13 2 5 9 3 2 11 13 1 7 8 6 7 5 13 5 9] 

X = 1×30

1 4 15 6 7 5 3 2 11 13 1 7 8 13 2 5 9 3 2 11 13 1 7 8 6 7 5 13 5 9

sum(reshape(X, 5, []))

ans = 1×6

33 34 31 30 35 39

[Steven Shaaya]

Walter, you are a livesaver every single time. Thank you