MATLAB: Lsim: Remove input signal from plot

lsimMATLAB

I am using the function lsim to plot a system response. How can I remove the input signal from the plot so that it only shows the response?

Best Answer

Hi cricketking13,
if you don't want to have lsim plot the default plot, just "collect" the output and plot as you desire:
%% LPF
order        = 3;
ripple       = 1; %pass band ripple
f_c          = 22e6;
[num1, den1] = cheby1(order, ripple, 2*pi*1.10*f_c, 'low', 's');
%% Create input signal
Fs       = 200e6;
Ts       = 1/Fs;
NFFT     = 2^12;
Runtime  = (NFFT-1)*Ts;
t        = 0:Ts:Runtime;
a_in     = 1;
fin      = 5e6;
phase_in = 0;
y_in     = a_in * sin( 2 * pi * fin * t + phase_in );  % 4096 points
%% filter signal
% create system
myFilter = tf(num1,den1);
% apply filter to time domain signal
[y_out, time] = lsim(myFilter,y_in,t);
% plot without y_in
plot(time,y_out')
Kind regards,
Robert
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