matlab问题,把下列程序中的n1=0:n-1;把n-1换成5,怎么运行出错了,同理n2,n3都换掉x=[2,3,4,5,6,7]; h=[3,5,3,4,5];n=6;m=5;l=10;n1=0:n-1;n2=0:m-1;n3=0:l-1; y=conv(x,h);subplot(131);stem(n1,x);grid on;title('x(n)'); subplot(132);stem(n2