8-10  ʹgridͼʾơ

>> % ʾGRID÷
>> % ûʹplotͼΣʹGRIDͼʾ
>> x=linspace(-5,5,100);
>> y=x.^4+22*x.^2-6*x+10;
>> plot(x,y)
>> grid on
>>

>> grid minor
>>
