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generate polynomial features given a vector X and degree


From: aliko
Subject: generate polynomial features given a vector X and degree
Date: Mon, 19 Dec 2011 16:09:55 +0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20111105 Thunderbird/8.0

Hi!

Is there a function to generate polynomial features given a vector X and degree. For example I have 3-element vector X and for given degree=3 I want to get a vector like

[X(1), X(2), x(3), X(1)^2, X(2)^2, X(3)^2, X(1)*X(2), X(1)*X(3), X(2)*X(3), X(1)^3, X(2)^3, X(3)^3, X(1)^2*X(2), X(1)^2*X(3), ... , X(1)*X(2)*X(3)]

For any given vector X of any length and for any given degree?
If there is no such function could anyone suggest an algorithm to build such a vector?

Thanks in advance!




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