How do I write coefficients from nonlinear fits to an array from a loop statement?

Question

Katherine 2017-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/342798-how-do-i-write-coefficients-from-nonlinear-fits-to-an-array-from-a-loop-statement

回答： Star Strider 2017-6-1

So I am trying to write the coefficients from nonlinear fits I'm doing to an array, but the loop function is writing over the values so I wind up with only the coefficients from the last fit. This is a portion of my code so far.

for Replicate_Loop = 1:Num_Days
  Model = char(Equations(Model_Loop,1));
                    ft_NoZeros = fittype(Model,'independent', 'x', 'dependent', 'y' );
                   [fitresult_NoZeros, gof_NoZeros] = fit( xData_NoZeros, yData_NoZeros, ft_NoZeros, opts);
      values=coeffvalues(fitresult_NoZeros);
end

I'm fairly new to Matlab, so I'm getting a bit lost when it comes to writing the values for each fit including nesting other for loops in, but I don't know the syntax very well. Any help would be really appreciated! Thank you!

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Answer 1

Star Strider 2017-6-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342798-how-do-i-write-coefficients-from-nonlinear-fits-to-an-array-from-a-loop-statement#answer_269192

在 MATLAB Online 中打开

I would save the results to cell arrays for each output you want to save.

Example —

for Replicate_Loop = 1:Num_Days
    Model = char(Equations(Model_Loop,1));
    ft_NoZeros = fittype(Model,'independent', 'x', 'dependent', 'y' );
    [fitresult_NoZeros{Replicate_Loop}, gof_NoZeros{Replicate_Loop}] = fit( xData_NoZeros, yData_NoZeros, ft_NoZeros, opts);
    values{Replicate_Loop}=coeffvalues(fitresult_NoZeros{Replicate_Loop});
end

Note: The curly braces ‘{}’ denote cell array indexing. See the documentation on Cell Arrays (link) for a full description of them and how to use them.