Sum of a signal in simulink

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Sam136
Sam136 2015-8-4
编辑： Yeow Yu Leong 2024-6-9
In my Simulink model, current value of a signal should be added to all previous value of the same signal. I've used integrator with initial value of zero to find it; however the result is different from what I find in Matlab through "sum" or "trapz" function. The solver is continuous with fixed step size. Any thought to resolve this issue. or any other block to use for this purpose instead of integrator?

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2015-8-4
编辑：Azzi Abdelmalek 2015-8-4
You can use a Matlab function block with this code
function y=fcn(u)
persistent a
if isempty(a)
a=0
end
y=u+a;
a=y;
You can also use a discrete transfer function 1/(z-1)

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2015-8-4
You could also use a unit delay:
  1 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2015-8-4
He is asking for all previous values. This will calculate out(n)+out(n-1)

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