I load in my data and plot it as follows:
load sunspot.datyear = sunspot(:,1); relNums = sunspot(:,2);How do I find just the two tallest peaks?
MATLAB: How to find the two tallest peaks in the data
findpeakshighestMATLABnpeakssignalsortstr
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While this may not yield the exact same functionality as 'findpeaks', a new function introduced in R2017b 'islocalmax' should have similar functionality.
https://www.mathworks.com/help/matlab/ref/islocalmax.html
If you take a look at the example below, I have provided some code below that is identical to the first part of the example using 'islocalmax':
https://www.mathworks.com/help/signal/ref/findpeaks.html#bufhyo1-1
load sunspot.datyear = sunspot(:,1);avSpots = sunspot(:,2);m = islocalmax(avSpots);plot(year,avSpots);hold on;plot(year(m), avSpots(m), '*');'islocalmax' does not have the exact functionality as 'findpeaks' but should suffice in some use cases.
ピーク値の数を定めるには 'NPeaks' オプションを使用します。
また、ピーク値をソートするには 'SortStr' オプションを使用します。
例えば、ピーク値の大きいものから5番目までを抽出したい場合は、以下のようなコードになります。
filename =('1.txt');x = load(filename);[pxx,w] = periodogram(x);plot(w,10*log10(pxx))xlabel('Frequency (Hz)')ylabel('Power/Frequency (dB/Hz)')[psor,lsor] = findpeaks(10*log10(pxx), w, 'NPeaks', 5, 'SortStr','descend');findpeaks(10*log10(pxx), w, 'NPeaks', 5)text(lsor+.02,psor,num2str((1:numel(psor))'))
最後のtextコマンドの部分は、ドキュメントの例 "ピークとその位置の検索" にあるものを使用しました。
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