Question

哪位大神给看看哪出错了，总显示“错误使用 plot 矢量长度必须相同，”

n=(1:1:98);
I=[0,0,0,0,22,30,31,36,41,43,45,47,48,49,49,50,50,50,50,50,...
50,50,49,49,49,48,48,47,47,47,46,46,45,45,44,43,43,42,42,41];
plot(n,I'.');

Answer 1

横坐标是n，有98个；纵坐标是l，只有40个数，横纵坐标个数不一样导致的错误。

将横坐标个数98换成40，代码如下：

 n=(1:1:40);

I=[0,0,0,0,22,30,31,36,41,43,45,47,48,49,49,50,50,50,50,50,...

  50,50,49,49,49,48,48,47,47,47,46,46,45,45,44,43,43,42,42,41];

plot(n,I'.');

运行结果为：