How to find value of X when Y reaches maximum value
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RAHUL YADAV
el 18 de Ag. de 2020
Comentada: RAHUL YADAV
el 20 de Ag. de 2020
Hello,
I am new to MATLAB Simulink, I want output as the value of X when Y reaches maximum.
Y is a calculated value from an equation and is a function of X
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/347391/image.png)
4 comentarios
Rik
el 18 de Ag. de 2020
I don't know much about Simulink, so I can't help you there. Once you have a function in Matlab itself you can use fminsearch. You want the maximum, so you would need to invert your function (inverted=@(varargin) -YourFunction(varargin{:});)
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maiaL
el 18 de Ag. de 2020
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/347499/image.png)
Not sure what kind of output you want, but one way would be to get the derivative of your y(x) function. When it's "zero", it's at a maximum or minimum. I added quotes to "zero" because it's not going to be zero due to the time step of the solver. In the above example I'm getting the absolute of the derivative and when it's <= 0.01, I get the x value.
4 comentarios
maiaL
el 19 de Ag. de 2020
I would try using the max block: https://www.mathworks.com/help/simulink/slref/find-max-value-of-input.html
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