fitting a function to data by changing a variable

Question

Robert Roy 2018-8-21

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/415664-fitting-a-function-to-data-by-changing-a-variable

评论： Saumya Goel 2018-8-30

stem='I:\Engineering\ChemEng\LaserGroup\Robert\Data\PMT HAB Measurements\21st Sept PMT HAB Profile\HAB Measurements\Eq1.7HAB';
n=18 
r=n-1;
r_Profile(n)=r;
r=int2str(r);
rest='.csv';
combinedStr=strcat(stem,r,rest);
Profile=csvread(combinedStr,50010,0,[50010,0,51000,1]);
t=Profile(:,1);
sig=Profile(:,2);
sig=sig-mean(sig(1:100));
sig=-((sig));
max_Profile(n)=max(sig).';
figure;
plot(t,sig);
nlinfit(t,sig,myfun)

Hi there, I would like to fit the data read in by 'stem' to myfun which is a modelled function in a different script which changes the variable named dp? Thanks

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dpb 2018-8-21

"... myfun which is a modelled function in a different script "

Have to save myfun as an m-file; functions in scripts are local within the script and thus aren't visible outside the script.

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Answer 1

Saumya Goel 2018-8-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/415664-fitting-a-function-to-data-by-changing-a-variable#answer_334666

If the function you are referring (myfun) is defined in a script, then it is going to be a local function and cannot be accessed outside the script. In that case, as dpb pointed out you may have to save myfun as an m-file and add it to the MATLAB path.

Also, make sure you are passing the argument as function handle in nlintfit function. Please find the documentation for the nlintfit function.

If you would like to know more about the function handle, you can find here.

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Robert Roy 2018-8-30

Thanks, Im now able to read in the function from another script now. Now I just have a problem with the nlinfit saying that theres not enough input variables?

Saumya Goel 2018-8-30