4.47.2 Greatest hits from previous weeks

4.47.2.1 Elegant operations on matrix rows and columns

https://mathematica.stackexchange.com/questions/3069/elegant-operations-on-matrix-rows-and-columns

 
Question 
 
The Mathematica tutorial has a section 'Basic Matrix Operations', describing operations like transpose, inverse and determinant. These operations all work on entire matrices. I am missing a  ...
 

- asked by sjdh (148 votes), answered by Mr.Wizard (50 votes)

4.47.2.2 How to create effect like Van Gogh's stroke brush?

https://mathematica.stackexchange.com/questions/39003/how-to-create-effect-like-van-goghs-stroke-brush

 
I need to apply Van Gogh's stroke brush effect to a random image 
 
 
Take the following image as an example: 
 
Thank you so much if you could help!
 

- asked by user10495 (30 votes), answered by Simon Woods (42 votes)