matlab画图出现问题

如图，为什么散点图出来了，后面的曲线图出不来，程序如下： x1=[0.0093,0.0187,0.0268,0.0277,0.0337];y=[10,20,30,40,50];plot(x1,y,'k*');hold onsyms xx=0:0.35y=4.1*10.^4*x1.^2-100*x1+7.4;plot(x,y,'r-.')

你的代码写得不够完善。应写才对（请自己核对一下，那些语句有问题）。

clc,clear all

x1=[0.0093,0.0187,0.0268,0.0277,0.0337];

y=[10,20,30,40,50];

plot(x1,y,'k*');

hold on

x=0:0.01:0.35;

y=4.1*10.^4*x.^2-100*x+7.4;

plot(x,y,'r-.')