curve fitting toolbox code

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saeed 2021-1-18

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https://ww2.mathworks.cn/matlabcentral/answers/720230-curve-fitting-toolbox-code

评论： dpb 2021-1-19

Hi everybody

I fitted my curve which goes over these two points(0,0) and(1,1) in matlab fitting toolbox, i want to extract what will be the y if x=2 in m.file.

How to convert toolbox to code and create function in which when I import x=2 it shows y=2 .

I don't know why the generation code is a function of x & y not only x.

Can anybody help me?

thanks

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saeed 2021-1-19

thanks for your reply but as i didn't understand what you said I make my question clear:

these are my point:

x=[1 2]

y=[2 4]

I open cftool, select x for xdata and y for ydata, then from the fit menu I click on "save to workspace" and save the 3 fits, now if I type fittedmodel(3) in the command section, it shows output=6, but if I close matlab then it doesn't show output 6, what should I do to call fittedmodel(3) from another m.file?

thanks

dpb 2021-1-19

You have to somehow get the fit object into the correct context; functions have their own context and so a new function doesn't know anything about the model you saved into the workspace.

Three basic options --

If you have the data available, build the model from the data in the function having used the fit tool to find the class of model that is satisfactory, or;
SAVE the fit object you created in the fit tool to a .mat file and load it back within the function, or
pass the object to the function from a context in which it does exist.

The tool can also build an m-file which will regenerate the model but it also either must read in the data again or have it stored internally.

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