How can I make the wave in the negative part disappear?

t= linspace(0,6,100);
y=sin(pi*t);
plot(t,y)

[Ans Flew]

I want it to be from 0 to 6 and the number of digits 100 and not 5000

Answer 1

[Stephan]

More resolution for the values + logical indexing:

t= linspace(0,6,5000);
y=sin(pi*t);
plot(t(y>=0),y(y>=0))