Thank you Daniel..
Educational purpose only.. I am in quarantine from work so I have deicded to spend time learning numerical analysis. I managed to buy a copy of Randy LeVeque -- Finite Difference Methods for ODEs and PDEs (the only book available at the university bookshop close to my home in Denmark, Copenhagen.)
I am simply trying to play around the concepts introduced in chapter 1 but I don't have Matlab license (too expensive).