Selective summary of matrix array

Hi,

I'm trying to create 1 x 5 matrix called A with following information:

Given:

Let's say r=exprnd(5,1,5) yields following result:

r =

2.7059 16.3678 8.9145 0.7997 6.0534

Let's say first value in above r matrix (2.7059) is now called r1

Let's say second value in above r matrix (16.3678) is now called r2 and so on to r5 (=6.0534).

In the end, matrix A will be: [0+r1, r1+r2, r1+r2+r3, r1+r2+r3+r4, r1+r2+r3+r4+r5]

Question: Is there a function I can use to simplify matrix A definition? I would like to create a 1x1000 matrix A.

Thank you in advance.

Answer 1

[KSSV]

Read about cumsum.

https://in.mathworks.com/help/matlab/re f/cumsum.html

iwant = cumsum(A) ;

[Daniel Lee]

wow that was quick and it was exactly what I was looking for. Thank you!!