Talk:K-SVD

notation issues
Note that $$x_i$$ is used to denote the $$i$$-column of $$X$$ and meanwhile, $$x_k^T$$ is used denote the $$k$$-th row of $$X$$ which can be confused with the transpose of the $$k$$-th column of $$X$$. We encourage to use other notations i.e. $$x^k_T$$ or $$x^{(k)}$$ to denote the $$k$$-th row of $$X$$. — Preceding unsigned comment added by 81.164.200.190 (talk) 19:20, 1 April 2023 (UTC)

Comparison to journal paper
Although the content is "similar" to the journal paper [Aharon 2006], the content here is an improved version, since at least 2 mistakes in the original journal paper (which are quite confusing) are corrected here. i.e. 1<=i<=N, and (i-th,wk(i)). Good job, editor! Diegozhangbit (talk) 12:58, 24 August 2015 (UTC)

clarifying the meaning of $$e_k$$
The meaning of the vector $$e_k$$ is not as clear as it should be, we should somehow indicate that it is a basis vector. — Preceding unsigned comment added by 67.169.95.68 (talk) 01:30, 5 September 2016 (UTC)

Possible improvements in user sandbox
User:Pakoch drafted some changes to a copy of this article in December 2015, but they were never implemented. Please see User:Pakoch/sandbox and either use the changes here, or blank the userpage with inactive userpage blanked if it is not helpful. – Fayenatic  L ondon 23:07, 6 August 2017 (UTC)