Cummulative Summing in Simulink

Hello community.

I am trying to do cumulative summing in Simulink, which I beleive creates a a loop. Can anyone

recommend how I accomplish it?

input signal ---> SUM BLOCK ----> output

0.2 0.2

0.3 0.5

0.1 0.6

0.5 1.1

0.7 ---> SUM BLOCK ---> 1.8

0.8 2.6

0.3 2.9

0.6 3.5

any feedback will be highly appreciated

Answer 1

[Andres Adam]

Hi A-Rod, you are right: we usually need a loop in this situation. A cumulative sum is usually done with a "memory" block like this:

I am using the 8 values you provided as an example.

I have seen other solutions such as using a "unit delay" block, integrator blocks, and the dedicated "Cumulative sum" block from the DSP System Toolbox.

I recommend paying attention to the time. When should the cumulative sum be performed? I changed my solver settings to take discrete steps at 1 second. Be careful to not run into issues where you are summing the same value more than once.

[A-Rod]

this is what I was looking for, thanks a lot for sharing and for furhter explanation.