plot regression line through first 5 peaks

Question

Ashlyn McCann 2021-3-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/768427-plot-regression-line-through-first-5-peaks

评论： Mathieu NOE 2021-3-11

I am trying to plot the first 5 peaks on the PSD and I am having trouble getting the peaks to plot in their correpsonding locations. I was wondering how to go about this.

 [maxpks, maxloc]=findpeaks(PSD);
 [s,t]=size(maxloc);
figure(1)
plot(fp,PSD)
hold on
fpml=fp(maxloc);
plot(fpml, maxpks, 'r*')
hold on
sortpks=sort(maxpks);
sortlocs=sort(maxloc,'descend');
[j,h]=size(sortpks);
J= [sortpks(j),sortpks(j-1),sortpks(j-2), sortpks(j-3), sortpks(j-4)]; %first five peak 
ML=[sortlocs(j),sortlocs(j-1),sortlocs(j-2),sortlocs(j-3),sortlocs(j-4)];
ML=[maxloc(s-4),maxloc(s-3),maxloc(s-2),maxloc(s-1),maxloc(s)]
plot(J,'y*')
 Fit = polyfit(ML,J,1); %linear regression 
 yfit = Fit(1)*ML+Fit(2); %equation of line 
 hold on
 plot(ML,yfit,'g-')
 hold off