MATH using numerical equation

How can I represent this equation using MATLAB ( Numerical Solution)

The equation

 (∂^2 f(x,y)/ ∂x^2)-(2 ∂^2 f(x,y)/ ∂y^2)+2f=2*cosy

Where f(0,y)=0 ; ∂f/ ∂x (0,0)=0 ; ∂f/ ∂y(0,0)=0

This is my program

Please tell me what is the mistake in my program

clear; clc;

Vx(1,:)=0;

Vy(:,1)=0;

h=0.1; f(1,:)=0;

for y=0:10

for i=1:10

    for j=1:10

        Vx(i+1,j+1)=(2.*cos(y).*h)+Vx(i,j);

        Vy(i+1,j+1)=h*f(i,j)+Vy(i,j);

        f(i+1,j)=f(i,j)+h*Vx(i,j);

        f(i,j+1)=f(i,j)+h*Vy(i,j);

    end

end

end

plot(f); grid

[Jan]

Please explain at first, why you assume, that there is a mistake. It would be a good strategy to share this knowledge with us.