Ridge Regression Code error message

Question

Eduardo Calixto 2020-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/520161-ridge-regression-code-error-message

编辑： Fatma HM 2020-12-1

Dear,

I wrode the following comand for Ridge regression:

X = file name

x = [Crack];

y = FFT;

n = length(y);

c = cvpartition(23,'HoldOut',0.3);

>> idxTrain = training(c,1);

>> idxTest = ~idxTrain;

>> b = ridge(y(idxTrain),X(idxTrain),lambda);

The logical indices contain a true value outside of the array bounds. (I´ve got this message. What´s wrong ?)

Thanks for your support !

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Answer 1

Raunak Gupta 2020-4-28

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Hi,

From the code I think the cvpartition that is created should have ‘n’ number of observation instead of 23. That is why the logical vector generated by training has size mismatch compare to X or y. Changing 23 to ‘n’ should work.

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Eduardo Calixto 2020-5-2

Thanks for your support Raunak ! I will try and let you know !

Fatma HM 2020-12-1

编辑：Fatma HM 2020-12-1

Hi Raunak, I have a questions how can i use the Ridge regression in matlab ? And if i have my inputs and output how will I use them in the code of ridge regression and what it will be the coefficient in ridge regression ? Please help me i can’t figure it out

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