Mode identification on a Graph.

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mpho bosupeng
mpho bosupeng 2021-4-24
回答： Clayton Gotberg 2021-4-24
Hello everyone,
I am a beginner with MATLAB and i need some assistance. I need to produce a graph similar to this one attached. I want to include the vertical dotted lines and the labelling on the graph (HF, IF, AND Trend). My question is how to I do this, I only know that this will need some threshold.
Thanks.
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mpho bosupeng
mpho bosupeng 2021-4-24
编辑：mpho bosupeng 2021-4-24
Thanks @Clayton Gotberg. The code is
plot(time,signal)
xlabel('year')
ylabel('PIL')
IMFH=IMF_R(1:end,2*L+1:end-2*L);
NumIMFH=size(IMFH,1);
sumIMFH=0;
for j=1:NumIMFH
sumIMFH=IMFH(j,:)+sumIMFH;
STH(j)=nanmean(sumIMFH)/std(sumIMFH);
indiH(j)=j;
end
figure
plot(indiH(1:end-1),STH(1:end-1),'ok')
ylabel('\mu/\sigma')
xlabel('c_j')
I need to analyze the points to find the regions
Adam Danz
Adam Danz 2021-4-24
You can also add the vertical lines using xline()
> I need to analyze the points to find the regions
Ok, let us know exactly what you need help with.

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采纳的回答

Clayton Gotberg
Clayton Gotberg 2021-4-24
It looks like you already have the code to find out where the divisions should be. In that case, all that remains to be solved is:
  1. The plot is missing the vertical lines to separate the regions
  2. The plot doesn't have the region labels
HF_IF_divider = ; % this value should be the point in x at which the HF and IF regions touch
IF_Trend_divider = ; % this value should be the point in x where IF and Trend meet
plot(data) % replace with all of the plotting you've done so far
hold on
% Add the vertical lines
xline(HF_IF_divider,'k--') % Thanks @Adam Danz for mentioning this great function
xline(IF_Trend_divider,'k--') % 'k' means black lines, '--' means dashed lines
label_x = [1/2*HF_IF_divider, 1/2*(IF_Trend_divider+HF_IF_divider),...
1/2*(length(signal)+IF_Trend_divider)]; % x positions of labels
label_y = [0.5 0.5 0.5]; % Change this to modify the height of the label
zone_names = ["HF" "IF" "Trend"];
text(label_x,label_y,zone_names,'HorizontalAlignment','center','VerticalAlignment','middle','FontSize',12);

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