A problem about y(x+1)

[Hidemons]

I've always had a problem understanding the concept of equations that do not simply start with Y(x) = ......

 

This one for example:

V(x+1) = V(x)+(g-(Cd/m)*v(x)^2)(ti+1-ti)

 

is one that I have to make into a plot for this program called Matlab. (for computing stuff)

 

Can someone explain this equation to me or enlighten me on the subject. How should I simplify this to make it more understandable?

[the tree]

Recurrence equations involve about as many techniques as differential equations. But you shouldn't need an analytic solution just for a plot of the system. A simple WHILE loop should generate a big enough set for an interesting plot.