Update zh.md

Author: zhiwu-huang

zh.md

@@ -19,7 +19,7 @@ Date     | Title        | Slides                             | Handouts  | Code
 ---------| ------------ | ---------------------------------- | --------- | ----- | ----- |
 26/01/26 | Introduction to Data Mining | [PDF](./lectures/pdf/00_introduction_ZH.pdf) | -- | -- | [Video](https://southampton.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=a12a6437-c0c3-4600-937a-b3de011a8cba) |
 29/01/26  | Discovering Groups | [PDF](./lectures/pdf/02_discovering_groups_ZH.pdf) | -- | [git](https://github.com/zhiwu-huang/COMP6237-Data-Mining-Demo-Code/blob/master/03_groups.ipynb) | [Video](https://southampton.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=10bd15bf-cc17-422c-ad91-b3e100c5eeaa)  |
-30/01/26  | Covariance, EVD, PCA & SVD | [PDF](./lectures/pdf/03_covariance_ZH.pdf) | -- | [git](https://github.com/zhiwu-huang/COMP6237-Data-Mining-Demo-Code/blob/master/04_covariance.ipynb) | -- |
+30/01/26  | Covariance, EVD, PCA & SVD | [PDF](./lectures/pdf/03_covariance_ZH.pdf) | -- | [git](https://github.com/zhiwu-huang/COMP6237-Data-Mining-Demo-Code/blob/master/04_covariance.ipynb) | [Video](https://southampton.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=ff5609d3-8d77-4fd7-89b3-b3e200f7093e) |
 
 <!--30/01/25 | Linear Regression I | [PDF](./lectures/pdf/LinearRegression.pdf) | -- | -- | [Video](https://southampton.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=62bea790-f2bc-4e3b-a8b1-b27500b55fc6)|
 03/02/25 | Linear Regression II        | -- | -- | -- | [Video](https://southampton.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=c192ef02-4037-4631-971c-b27900c723a7)|