Cut a signal in Time domain

Hey ,

for a project i have to generate a sinusoidal signal(force signal) and a second signal with a step function(speed signal) , then try to get the amplitude of the force signal and the phase difference to the speed signal. In which i have to cut the force signal in time domain in the same time of the step of the speed signal , and then show the amplitude and phase at that point using FFT. any Ideas ?

[Sam Chak]

Hi @Hamza Hamza, can you sketch a diagram of the force signal that you want to "cut" with relative to speed signal?

[Hamza Hamza]

here is the signal , a normal cosin function which i need just to take the second half of it for example (starting from 1 sec) . I will be very glad for your help.

[Mathieu NOE]

see example below

clc
clearvars

t = (0:0.01:2);
y = cos(2*pi*5*t);


% select second hal of signal , t>= 1 
ind = (t>=1) ; % logical array
t2 = t(ind);
y2 = y(ind);

plot(t,y,t2,y2,'r')