How to reduce the dimensions of a row vector?

Question

Yashaswini MU 2016-2-29

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https://ww2.mathworks.cn/matlabcentral/answers/270574-how-to-reduce-the-dimensions-of-a-row-vector

回答： John D'Errico 2016-3-2

Hi, I have a row vector of dimensions 1*2500. I want to extract features from this vector and reduce the dimensions of the vector using PCA. Can someone please give me the matlab code for it?

Thank U.

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Answer 1

Roger Wohlwend 2016-3-2

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You cannot apply PCA on a vector. You need a matrix for that.

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Answer 2

John D'Errico 2016-3-2

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PCA is meaningless as applied to a single vector.

So, you need to either learn what PCA is (read one of books on the subject) or go back to the person who told you to do this, and ask them what they really meant for you to do.