export data from fitresult

Question

Cristina Totaro 2021-1-29

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/730708-export-data-from-fitresult

回答： Jiarui Kang 2022-6-29

Hi,

I am new on Matlab, I hope that someone can help me.

I have to make the fit of several files. I generated the code and I was able to perform the fit of all these files simultaneously.

My problem is to export the results of each fit as single txt files, because I have then to extract specific values of the function to perform other analyses.

I hope I have been clear enough.

Thank you.

Cristina

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Scott Ronquist 2021-1-29

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Hello Cristina,

Are you using the fit command to create a fitobject? And you would like to save the output of fitobject to a text file? To do this you can use the diary function in MATLAB to store all results output to the command window in a text file. See Example below:

% load data
load census;
% fit data
f=fit(cdate,pop,'poly2');
% capture output in "myDiaryFile.txt"
diary myDiaryFile.txt
f
diary off

Please let me know if I am understanding your problem correctly, thanks!

Cristina Totaro 2021-2-1

Hi,

thank you very much for your reply.

Actually, I need to save only the values of the coefficients of the fuction (it is a poly3), not all the info, because I have to use these values to obtain some specific values of the fuction itself.

However, your suggestion is useful for another step of my process.

Thank you again.

Cristina

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Answer 1

Jiarui Kang 2022-6-29

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/730708-export-data-from-fitresult#answer_996020

The data of a fitted curve can be extracted using feval function.

First right click on your fitted data in curve fitting tool box and save it in your workspace. Then use feval function to evaluate the value for inputs.

for example

x=[0:0.0005:0.16];

y=feval(fittedmodel,x);