why the output derivative signal is not perfect ?

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El Mehdi FADEL 2018-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/390744-why-the-output-derivative-signal-is-not-perfect

评论： John D'Errico 2018-3-26

Hello i want to derive my sinusoida signal but the result is not that i am searching for.how to solve this problem in simulink ?

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El Mehdi FADEL 2018-3-26

this is my model

John D'Errico 2018-3-26

I do not have simulink anyway, so I can only point out that you have only posted a picture of the model, instead of the model file itself. So we still cannot see exactly what was done there.

For example, I would want to point out that simulink simulates a system in discrete steps. So that sine wave is not a continuous function. Therefore, a derivative of that sampled function will not be only approximate.

Again, I've never used Simulink, so this might be only a wild guess. But the answer seems pretty clear.

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