How can you get a mathmatical function from a simulink plot?

For the graph added in the picture I need to have a mathmatical function. Can someone please give me the steps needed in order to archieve this?

[Alex Sha]

If possible, provide your data please,rather than a picture only.

[Auke Roddeman]

Dear Alex,

I have tried the following:

• log the graph as a dataset
• try to load it

But I get an error, please watch the pictures provided.

[Alex Sha]

So, where is your data file?

[Auke Roddeman]

The scope does not provide the option to chose a place to store the data. Also I cannot find in on my pc.

Answer 1

[Andy Bartlett]

Finding a model or function is a very broad field.

Depending on the nature of the problem and requirements, many tools and techniques might fit the need.

Potential tools include MATLAB's polyfit, A\B or Curve Fitting Toolbox or System Identification Toolbox

Since your plot is coming from a Simulink model, I suggest you explore

Simulink Control Design's model linearizer which provides tools for getting a linear dynamic system model fit to a section of a Simulink model.

[Auke Roddeman]

Dear Andy,

Thank you for this answer but I am currenly not able to dive to deep into this app, although I allready have it. For my problem I am looking for a more specific answer.