x=o:pi/100:2*pi;
y1=2*cos(x);
y2=cos(x);
y3=0,5*cos(x);

>> plot(x,y1,'-',x,y2,'-',x,y3,':')
>> ylabel('cosine functions')
>> xlabel('0 \leq x \leq2 \pi')
>> legend('2*cos(x)','cos(x)','0.5*cos(x)')
>> title('Typical example of multiple plots')
>> axis([0 2* pi -3 3])

t=0:pi/202:2*pi;
plot(t,sin(t),'-.r*')
hold on
plot(t,sin(t-pi/2),'--mo')
plot(t,sin(t-pi),':bs')
hold off