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close all; 
clear all; 
a=0;b=2;c=0;d=1; 
n=6;m=5;TOL=1e-10; 
ITMAX=100; 
f=inline('x*exp(y)','x','y'); 
ga=inline('0','x','y');gb=inline('2*exp(y)','x','y'); 
gc=inline('x','x','y');gd=inline('exp(1)*x','x','y'); 
h=(b-a)/n; 
k=(d-c)/m; 
x=linspace(a,b,n+1); 
x=x(2:n); 
y=linspace(c,d,m+1); 
y=y(2:m); 
u=zeros(n-1,m-1); 
lmd=h^2/k^2; 
mu=2*(1+lmd); 
%l=1; 
%while (l<=ITMAX) 
for k=1:61 
    z=(-h*h*f(x(1),y(m-1))+ga(a,y(m-1))+lmd*gd(x(1),d)+... 
	  lmd*u(1,m-2)+u(2,m-1))/mu; 
    u(1,m-1)=z; 
    for i=2:n-2 
         z=(-h*h*f(x(i),y(m-1))+lmd*gd(x(i),d)+u(i-1,m-1)+... 
	       u(i+1,m-1)+lmd*u(i,m-2))/mu; 
         u(i,m-1)=z; 
    end 
      z=(-h*h*f(x(n-1),y(m-1))+gb(b,y(m-1))+... 
	  lmd*gd(x(n-1),d)+u(n-2,m-1)+lmd*u(n-1,m-2))/mu; 
	  u(n-1,m-1)=z; 
	   for j=m-2:-1:2 
	    z=(-h*h*f(x(1),y(i))+ga(a,y(j))+lmd*u(1,j+1)+... 
	       lmd*u(1,j-1)+u(2,j))/mu; 
	    u(1,j)=z; 
	    for i=2:n-2 
	        z=(-h*h*f(x(i),y(j))+u(i-1,j)+lmd*u(i,j+1)+... 
		    u(i+1,j)+lmd*u(i,j-1))/mu; 
		    u(i,j)=z; 
       end 
           
	  z=(-h*h*f(x(n-1),y(j))+gb(b,y(j))+u(n-2,j)+... 
	    lmd*u(n-1,j+1)+lmd*u(n-1,j-1))/mu; 
	    u(n-1,j)=z;  
    end 
	    z=(-h*h*f(x(1),y(1))+ga(a,y(1))+lmd*gc(x(1),c)+... 
	       lmd*u(1,2)+u(2,1))/mu; 
	    u(1,1)=z; 
	   for i=2:n-2 
	     z=(-h*h*f(x(i),y(1))+lmd*gc(x(i),c)+... 
		   u(i-1,1)+lmd*u(i,2)+u(i+1,1))/mu; 
		   u(i,1)=z; 
       end 
	       z=(-h*h*f(x(n-1),y(1))+gb(b,y(1))+lmd*gc(x(n-1),c)+... 
		      u(n-2,1)+lmd*u(n-1,2))/mu; 
		   u(n-1,1)=z; 
         %if(NORM<=TOL) 
       x' 
       y' 
       u' 
         %l=l+1; 
         %end 
     end 
%error('³¬³öITMAXµÄ·¶Î§');