Problem solving DE neural network

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Melda Harlova
Melda Harlova 2020-1-8
Hi,
I need a help with this solution expecially with the last line mesh(x1,x2,y). Error: Unrecognized function or variable 'x1' and 'x2'
clear all
load zad2.mat
k=1; n=length(x);
for i=1:n
for j=1:n
z(i,j)=u(i,j);
p(1,k)=x(i);
p(2,k)=y(j);
t(k)=z(i,j);
k=k+1;
end
end
figure(1), mesh(x,y,z);
net=newff(minmax(p),[3,1],{'tansig','purelin'},'trainlm');
net.trainParam.epochs=100;
%net.trainParam.goal=0.001;
net=train(net,p,t);
for i=1:n
for j=1:n
y(i,j)=sim(net,[x(i);y(j)]);
end
end
figure(2),mesh(x1,x2,y)
where file zad2.mat is generated here with this code:
clear all
n=25; k=50; h=1/n; N=n+1;
y = 0:h:1;
x=0:h:1;
for i = 1 : N
u(i,1)=0;
u(i,N)=x(i);
end
for j = 1 : N
u(1,j)=exp(y(j))+(1-exp(1))*(y(j)^2)-1;
u(N,j)=y(j);
end
for m=1:k
for i=2:n
for j=2:n
u(i,j)=(u(i-1,j)+u(i+1,j)+u(i,j-1)+u(i,j+1))/4;
end
end
end
figure(1), mesh(x,y,u)
figure(2), contour(u)
save zad2.mat x y u

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