I have found the derivatives wrt to x and y using the central difference formula below:

Result from after running (MATLAB command prompt)Code:f=@(x,y)2*x^2*y+3*x*y^3;%function_handle h = 1e-10;%step size xi = 2;%Point to evaluate function yi = 1; % Estimate derrivatives by central difference method dfdx = (f(xi+h,yi)-f(xi-h,yi))/(2*h) dfdy = (f(xi,yi+h)-f(xi,yi-h))/(2*h)

Can I use these values to find the value of at this point?Code:dfdx = 11.0000 dfdy = 26.0000 EDU>>

Regards Elbarto