%8-9  ʹlegendͼεͼע

>> % ʾLEGEND÷
>> % ûʹPLOTͼΣʹLEGENDͼεͼע
>> x=linspace(-3,5,100);
>> y=cos(x);
>> z=sin(x);
>> plot(x,y,x,z)
>> title('һߺһ')
>> xlabel('xȡֵΧ')
>> ylabel('YZֵ')
>> legend(' y=cos(x)', ' z=sin(x)');
>>

>> legend(' y=cos(x)', ' z=sin(x)',2);
>>
