how to draw vertical lines on the plot?

Question

Olga 2012-3-14

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32294-how-to-draw-vertical-lines-on-the-plot

评论： Safwaan Kraft 2019-3-31

Hello, I'm doing HRV spectral analysis and I want draw vertical lines around freq bands on my plot. It'd be great if each area could be in different colour. If anyone could give me any tip, shall be very grateful ;)

I need to add this to this plot:

%Calculate PSD
    [PSD,F] = pwelch(odstepRR,128,64,[],fs); %uses a hamming window
      VLF = [0.0033 0.04];
      LF = [0.04 0.15];
      HF = [0.15 0.4];
      % find the indexes corresponding to the VLF, LF, and HF bands
      iVLF= (F>=VLF(1)) & (F<=VLF(2));
      iLF = (F>=LF(1)) & (F<=LF(2));
      iHF = (F>=HF(1)) & (F<=HF(2));
      % calculate areas, within the freq bands (ms^2)
      aVLF=trapz(F(iVLF),PSD(iVLF));
      set(handles.vlf, 'string', num2str(aVLF));
      aLF=trapz(F(iLF),PSD(iLF));
      set(handles.lf, 'string', num2str(LF));
      aHF=trapz(F(iHF),PSD(iHF));
      set(handles.hf, 'string', num2str(aHF));
      aTotal=aVLF+aLF+aHF;
      set(handles.tp, 'string', num2str(aTotal));
      %calculate LF/HF ratio
      lfhf =aLF/aHF;
axes(handles.axes5);
set(handles.text45, 'visible', 'on')
set(handles.axes5, 'visible', 'on')
%plot area under PSD curve
area(F(:),PSD(:),'FaceColor',[.6 .6 .6]);        
grid on;