How to implement Linear Aproximation of a function

How one can translate the linear approximation of the function f(x,y) into MATLAB. The resulting approximation given by :

f(x,y) = f(x0,y0) + fx(x0,y0)(x-x0) + fy(x0,y0)(y-y0)

both x0 and y0 are known but how this can be translated into MATLAB

[Jonathan Brake]

me too brotha man

Answer 1

[Birdman]

The attached file pplane8 might help you. This tool helps you to identify nonlinear two variable first order differential equations and find the equilibrium points and draw phase portraits.