Effacer les filtres
Effacer les filtres

How can I remove linear trend of a regression ?

2 vues (au cours des 30 derniers jours)
Mallouli Marwa
Mallouli Marwa le 13 Juin 2018
Hi
To remove linear trend of the curve 'figure (5)', I have used the function detrend but an error was mentioned.
The trend of the curve wanted is attached.
Please help me.
The data used are attached.
The program is
%%
%objet : traitement signal MPF
clc;
clear;
close all;
cd Z:\Matlam\Curves_oscillo_Pc %%
%% load 'data1.txt';
tmp = data1(:,1);
disp = data1(:,2);
acc = data1(:,3);
%on recupère les données Oscilloscope en Volt load 'data4V.txt';
tmpV = data4V(:,1);
Volt = data4V(:,2);
figure(3)
plot(tmpV,Volt,'b',tmpV,Volt,'r.');
xlabel('time (sec)');
ylabel('Voltage(V)');
%%
L=length(tmp)
Lv=length(tmpV)
Fs = 833333333.333; % Sampling frequency
NFFT = 2^nextpow2(L) % Next power of 2 from length of y
NFFTV = 2^nextpow2(Lv) % Next power of 2 from length of y
figure(5)
VOLT = fft(Volt,NFFT)/L; % Calcul de la FFT
amplitude = 2*abs(VOLT(1:NFFT));
f = Fs/4*linspace(0,1,NFFT/2);
semilogy(f(1:NFFT/12),2*abs(VOLT(1:NFFT/12))/(2*abs(ACC(1:NFFT/12))));
y = detrend (abs(VOLT(1:NFFT/12)))
semilogy(f(1:NFFT/12),2*(y))
xlabel('frequency [Hz]')
ylabel('FRF Volatage [V]')

Réponses (0)

Catégories

En savoir plus sur Linear and Nonlinear Regression dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by