矩阵元素根据Matlab中的索引进行变化

I have two functions f(x,y) and g(x,y), where, let say x and y change from x=x0:xt:xN and y=y0:yt:yM (in my real problem these are long vectors). First I want to find minimum of each set, e.g. say Min(i,j)= min(f(x(i),y(j)),g(x(i),y(j))), and then I want to find maximum of all Min(i,j), and also corresponding x(i) and y(j).I have two functions f(x,y) and g(x,y), where,