Combined Sine wave with multiple amplitudes

I wanna plot a sine wave,50 hz with amplitude 1.0 units for 5 cycles and then with an amplitude of 4.0 units for another 3 cycles with the same frequency !Kindly help with the code to do the same

Answer 1

[Davide Masiello]

Do this,

f = 50;
T = 1/f;

t1    = linspace(0,5*T,1000);
wave1 = sin(2*pi*f*t1);

t2    = linspace(5*T,8*T,1000);
wave2 = 4*sin(2*pi*f*t2);

plot([t1,t2],[wave1,wave2])