Raetsel der Woche

clear
x = 1:0.5:10;
y = 1:0.5:10;
f = @(a,b) (a-b).*10.^(1+floor(log(a+b-1)/log(10)))+(a+b-1);

A = zeros(length(y),length(x));
for i = 1:length(x)
    for j = 1:length(y)
        A(j,i) = f(x(i),y(j));
    end
end

surf(x,y,A)
xlabel('X')
ylabel('Y')