increasing amplitude of sine wave

hi i want to create i simple sine tone that has increasing amplitude kinda like a fade in 3 seconds

i wrote the following code its just a normal sine tone with Frequency is 3000 hz and amplitude of 1

Fs = 44100;
   dt = 1/Fs;                  
   StopTime = 3;             
   t = (0:dt:StopTime-dt)';     
   Fc = 3000; 
   A = 1;
   y = A*sin(2*pi*Fc*t);
   sound(y,Fs)

how can i make the amplitude start from 0 and inrease linearly to 1 in 3 seconds like a fade?

Answer 1

[Les Beckham]

Fs = 44100;
dt = 1/Fs;
StopTime = 3;
t = (0:dt:StopTime-dt)';
Fc = 3000;
A = linspace(0, 1, numel(t))';
y = A.*sin(2*pi*Fc*t);
plot(t,y)
grid on

[Mohamed Turkmani]

thank you works perfect

[Les Beckham]

You are quite welcome.

Answer 2

[Torsten]

y=t/StopTime.*sin(2*pi*Fc*t);

instead of

y = A*sin(2*pi*Fc*t);