matlab x=[1 2 3 4]; y=[4 2 3 1]; U=800+1000*sin(x.*(pi/15))*

matlab x=[1 2 3 4]; y=[4 2 3 1]; U=800+1000*sin(x.*(pi/15))*sin(y.*(pi/15));
不是点乘吗?数组不是点乘吗、
Error using ==> mtimes
Inner matrix dimensions must agree.