hello.
i wrote this code in matlab

t=[0:0.2e-3:3e-3];
f=2*pi;
v=sin(f*t*1000);
plot(t,v)

and my sine plot is looking like this


why dosent it look like a normal sine wave

 

How many samples are you generating each cycle?

 

How many samples are you generating each cycle?

i fix my problem with more samples. tnx

 

Good.

A good rule of thumb is that you need at least about ten samples per cycle for it to look halfway decent for humans -- more is better. But, from a sampling theorem and information theory standpoint you can get by with less.