Useful links and websites:
1. https://www.youtube.com/watch?v=moqPyJQHR_s (Linear discriminant analysis)
2. https://www.youtube.com/watch?v=t-V6y5jwcsA
3. http://matlabdatamining.blogspot.com/2010/12/linear-discriminant-analysis-lda.html
4. https://yarpiz.com/
5. https://uk.mathworks.com/matlabcentral/fileexchange/