# matlab polyfit multiple sets of y data

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peter huang2023-3-16

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];
%%
y1 = [10; 20; 30; 40; 50];
y2 = [15; 25; 35; 45; 55];
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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

### 回答（1 个）

KSSV 2023-3-16
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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