Put option pricing (plain vanilla)

This set of m-files was done only with didactic purposes in mind, it could be used as a calculator, but its main intention is to show how the price of a plain vanilla put option evolves through time; showing the video of the evolution as well as the 3-D surface. (In case you want speed, just get rid of the videos and don't use the for loop). explicit, implicit and Crank-Nicolson schemes can be compared.