如何对正弦波进行相移-MATLAB？

Question

I want to phase shift a sinusoidal wave as shown below.

What is happening here is that a phase shift occurs at the point of the red line. So, instead of following its natural path(dotted lines), it begins to follow the shifted path(dashed line).

I have tried to code it as follows.

clear;

t =(0:10000)/10000';

for ii = 1:length(t)

 x(ii)=exp(i*2*100*t(ii));

   if ii == 235      % point at which the phase shift occurs

        x(ii) = x(ii)*exp(-i*(pi/4));

   end

 end
 plot(t,real(x));

Can someone tell me the mistake in my code?

Answer 1

clear;

t =(0:1000)/10000';

for ii = 1:length(t)

 x(ii)=exp(i*2*100*t(ii));

   if ii >= 235      % point at which the phase shift occurs

        x(ii) = x(ii)*exp(i*(pi/4));

   end

 end
 plot(t,real(x));

Just change == as >= in if statement.

The result is as follows.