I have this matlab code which calculates the autocorellation of data. I want the timespan over which the autocrrelation is lower than 50% of the maxmimum value how can I get that
DataTbl=readtable('6smaalbasorber10ssweeptimeusedthis.csv');
[Ro,Co]=size(DataTbl);
Data=table2array(DataTbl);
Time=Data(:,1);
S21Mag=Data(:,2);
S21Ang=Data(:,3);
%%% DAta Preperation %%%%%%
[Re,Im]=pol2cart(S21Ang,S21Mag);
CmpLx=complex(Re,Im);
ampitude=sqrt((Re .^2)+(Im .^2)); % amplitude value
ampitudedB= 20*log10(ampitude); % amplitude in dB
plot (Time,ampitudedB); %Amplitudein db verus time
y1 = ampitude;
%# autocorrelation
maxlag = 10; %# set a max lag value here
[c,lags] = xcorr(detrend(y1), maxlag, 'biased');
Cmax =max(c);
halfmax=0.5*Cmax; % calculates half of the maximum
% Here I need to add something such that I will get the timelag where
%the autocorrelations drops to 50% of maximum
%# plot
plot(lags,c), xlabel('lags [seconds]'), ylabel('autocorrelation')
I tried to implement something according to your short descripiton. I don't have the function xcorr so i could only guess the respective variables. at least you can modify the code since the semantic won't change
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