MATLAB: Hello guys.this is the code.x2 and y2 are the experimental data while pt and y12 are the theoritical fittings.y2 has 10 values while y12 has 450 points.i need to take the 10 points from theoritical on the same pt as experimental

x2y12y2

code

Best Answer

Simple, you may use interpolation to get what you want.

%%Get 10 points from theoritical on the same pt as experimental
x2i = x2 ;
y2i = interp1(pt,y12,x2i) ;

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MATLAB: Frequency response of discrete PT1

Found the error by myself now.

I did not use the instantaneous frequency for the calculation of the sweep signal, as stated here or here.

The corrected code is:

clear
%% Input (linear frequency sweep)
Ts = .1e-3;
duration = 30;
t = (0:Ts:duration);
fs = 1/Ts;
f = (fs/2)*t/duration;
finst = 1/2*(fs/2)/duration*t;
u = sin(2*pi*finst.*t);
%% PT1-system continuous
T1 = 1e-3;
G = tf(1,[T1 1]);
%% PT1 discretized
H = c2d(G,Ts,'zoh');
x0 = 0;
%% PT1 trasient response
x = lsim(H,u,[],x0,'zoh');
%% PT1 freq. response
[h,~] = freqz(H.Numerator{1:end},H.Denominator{1:end},f,fs);
%% Plot
figure(1),clf(1),hold on
plot(u),plot(x),plot(abs(h))

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MATLAB: Frequency response of discrete PT1

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