viewLevel8Approximation(t,ekg_Trend,approxRecon);
%% Visualize approximation subbands for level 9 and level 10
viewApproximationSubbandReconstruction(t,ekg_Trend);
%% Isolate and visualize the trend
isolateTrendPlot(t,ekg_Trend);
%% Remove the trend component from the signal
coeffs = modwt(ekg_Trend,10); 
coeffs(11,:) = 0;          %setting approximation coefficients at level 10 to zero
sigOut = imodwt(coeffs);
完整代码：mbd.pub/o/bread/mbd-Y5yVlJhq
viewDetrendedSignal(t,ekg_Trend,sigOut)