Definite Integrals in Simulink with a = last time step, b = current time step

Question

Victoria 2012-11-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/53736-definite-integrals-in-simulink-with-a-last-time-step-b-current-time-step

I need to put this equation in my Simulink model:

A = B*(tn-tn1) where tn = current time, and tn-1 = last time step.

I think it would be easy if the time step was known and constant, but if I wanted to use variable time step, I am not sure how I would do this in Simulink. Would I need to do some sort of a definite integral using a = last time step, and b = current time step?

I would think that there is a much easier way.

Thanks in advance!

Vicky