Code optimization for loop

Oleg Tolstenkov

2018 8 8

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2 次查看（30 天）

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Dear experts could you help me to optimize the code please? My files represent a long series of data points in many columns and it takes ages to calculate the parameters I need by the for loop. My computer is not so powerful too. I tried parfor, it did not help much. Thank you. Oleg

 filename= 'data.xlsx';
signal=xlsread(filename,'b:t');
Time=xlsread(filename,'a:a');
detrend_data = detrend(signal, 'linear');
nSig = size(detrend_data);
N = 0;
NPEAKS = zeros([nSig,1]);
NINT = zeros([nSig,1]);
for jj = 1:nSig(2)
  [pks, locs, width, p] = findpeaks(detrend_data(:,jj),Time,'MinPeakProminence',0.1,'MinPeakHeight',0.2,'MinPeakDistance',0.5,'Annotate','extents','WidthReference','halfprom');
  peakInterval = diff(locs);
  lp = length(p);
  li = length(peakInterval);
  N = max(N,lp);
  Ni=max(N,li);
  NPEAKS(1:lp,jj) = cat(2,pks);
  NLOCS(1:lp,jj) = cat(2,locs);
  NWIDTH(1:lp,jj) = cat(2,width);
  NPROM(1:lp,jj) = cat(2,p);
  NINT(1:li,jj) = cat(3,peakInterval);
  end
NPEAKS = NPEAKS(1:N,:);
NLOCS = NLOCS(1:N,:);
NWIDTH = NWIDTH(1:N,:);
NPROM =NPROM(1:N,:);
NINT=NINT(1:Ni,:);
sheet=1;
sheet2=2;
sheet3=3;
sheet4=4;
sheet5=5;
filename2= 'peaks_data';
xlswrite(filename2,NPEAKS,sheet);
xlswrite(filename2,NLOCS,sheet2);
xlswrite(filename2,NWIDTH,sheet3);
xlswrite(filename2,NPROM,sheet4);
xlswrite(filename2,NINT,sheet5);