matlab polyfit multiple sets of y data

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peter huang ，2023-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/1929650-matlab-polyfit-multiple-sets-of-y-data

编辑： Dyuman Joshi ，2023-3-16

If I have multiple sets of data (y) under the same x condition, how can I polyfit a fitting line representing these data

If I have multiple y data, how can I use polyfit to get a fitting line about the two y data or what method should I use to get a line representing the two data

x = [1; 2; 3; 4; 5];

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y1 = [10; 20; 30; 40; 50];

y2 = [15; 25; 35; 45; 55];

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Dyuman Joshi 2023-3-16

编辑：Dyuman Joshi 2023-3-16

How do you get y1, y2, ...? Are they output from some code or are you manual inputting them?

Dynamically naming variables is not a good idea - Why Variables Should Not Be Named Dynamically

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Answer 1

KSSV 2023-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/1929650-matlab-polyfit-multiple-sets-of-y-data#answer_1194150

Run a loop for each set.....

Let y be your mxn data and x be your 1xn data.

p = cell(m,1) ; 
for i = 1:m
    p{i} = polyfut(x,y(i,:),2) ; 
end

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peter huang 2023-3-16

If I have multiple y data, how can I use polyfit to get a fitting line about the two y data or what method should I use to get a line representing the two data

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