rearrange an equation in simulink

Question

Pablo Sevilla 2021-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/1448459-rearrange-an-equation-in-simulink

评论： Pablo Sevilla 2021-9-8

I have the following equation modelled in simulink:

y=D·sin(C·arctan(B·x -E·(B·x - arctan(B·x))))

where x is the input variable and B,C,D and E are constants. So I can obtain the y value for any x input.

Lets say I want the other way around, puting an y value as input and get x value. Is there any easy way to do that? or do I need to do all the math to get x=f(y) and create another model?

Thank you!

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Answer 1

Paul 2021-9-7

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I'm not necessarily recommending this, but since you asked you can try an Algegbraic Constraint block.

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Pablo Sevilla 2021-9-8

It worked!

The Algebraic Constraint block did the trick!

Thank you!

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Answer 2

cr 2021-9-7

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No known blocks/methods to pull off such a thing in Simulink. Did you try symbolic math?

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Pablo Sevilla 2021-9-8

Thanks for the suggestion. I've tried to get x=f(y) with the "solve" and "isolate" commands but it seems that matlab couldnt isolate x in this formula.

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