Getting wrong sine wave for frequency 10KHz

Hi,

I'm plotting sine wave with frequency 10KHz.

But not getting it as expected.

What is the reason for this?

Code is here

plotted signal

Answer 1

[Stephan]

Think about your sampling rate:

f = 10000;
t = 0:1/(25*f):0.002;
plot(t,sin(2*pi*f.*t))