www.gusucode.com > wavelet 源码程序 matlab案例代码 > wavelet/MultifractalSpectrumOfHeartRateVariabilityExample.m

    %% Multifractal Spectrum of Heart-Rate Variability
% Compare the multifractal spectrum of heart-rate variability data before
% and after application of a drug that reduces heart dynamics.
load hrvDrug;
predrug = hrvDrug(1:4642);
postdrug = hrvDrug(4643:end);
[dhpre,hpre] = dwtleader(predrug);
[dhpost,hpost] = dwtleader(postdrug);
plot(hpre,dhpre,hpost,dhpost)
xlabel('h')
ylabel('D(h)')
grid on
legend('Predrug','Postdrug')
%%
% The spread of the Holder exponent values before drug administration 
% (approximately 0.08 to 0.55) is much larger than the spread of the 
% values afterward (approximately 0.08 to 0.31). This indicates that the
% heart rate has become more monofractal.