How to identify and erase the cells with the error "Error using fit>iFit (line 348). NaN computed by model function, fitting cannot continue" in an array?

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Angelavtc 2021-12-15

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评论： Ive J 2021-12-16

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Dear community,

I have an array (720*1 cell) where in each cell, I have a set of variables x and y. I am estimating the best fit curve for each set. However, my loop stops and gives me the error: "Error using fit>iFit (line 348). NaN computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients."

How to identify all the cells with this error and remove them from the array? This is the code that I use:

ft1= fittype( 'power2');
for k = 1 : length(Array_january)
    fit_curve{k}= fit(x{k},y{k},ft1);
end

Thank you in advance!

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Angelavtc 2021-12-16

@Ive J Thank you very much! I don't see where I can accept your answer :(

Ive J 2021-12-16

Posted as answer now :) appreciate it!

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Ive J 2021-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/1611545-how-to-identify-and-erase-the-cells-with-the-error-error-using-fit-ifit-line-348-nan-computed-by#answer_856660

在 MATLAB Online 中打开

ft1= fittype( 'power2');
fit_curve = cell(length(Array_january), 1); % never forget preallocation!
for k = 1:length(Array_january)
    try
        fit_curve{k} = fit(x{k}, y{k}, ft1);
    catch
        fprintf('error encountered index:%d\n', k)
    end
end
failedIdx = find(cellfun(@isempty, fit_curve));