mmDerivative(t,y)

This function calculates the derivative of a matrix w.r.t to another matrix

this function takes input as time matrix and the matrix you want to take
derivative of, quite accurate
suppose you have a matrix of speed as S = [ 1 2 3 4]; and time as T= [ 4 5 6 12] , then this
function (matrix- matrix derivative) mmDerivative (T,S) gives you a matrix dy which is the derivative of S w.r.t to T i.e.. velocity,quite helpful when you dont have a relation between two variables, but have their matrices