Plotting in a specific range

lets say i have this simple code:

Res=[];
for i=10:2:50
for t=1:1:3
y=i*t
Res=[Res; i t y ]
end 
end 

How can I plot i-y curve but only when i>20 ?

[Torsten]

plot(Res(:,1),Res(:,3))

xlim([21,50])

[ILAYDA GULSEN KOCAK]

thank you very much , it worked.

Answer 1

[Fangjun Jiang]

index=Res(:,1)>=20;
plot(Res(index,1),Res(index,3))