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Old 05-06-2016, 09:20 AM
ntvy95 ntvy95 is offline
Join Date: Jan 2016
Posts: 37
Default Re: invalid points in Z transform

Originally Posted by pouramini View Post
Thank you, yes that seems helpful if we regard all points in Z space, but I thought it speaks about the points in Z which are the mapping of a point in data set D.
Hm, in my understanding, the quote "some points in the Z space may not be valid transforms of any x E X" regards all the points in the Z space. For example: If z = \Phi (x) = [1, x^{2}_{1}, x^{2}_{2}], then the point z = [1, -3, -5] in the Z space cannot be a valid transform of any x \in X.
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