How to find seven peaks in matrix 8192X8192?

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Daniel Fonsêca
Daniel Fonsêca 2018-9-20
编辑： jonas 2018-9-20
Hello! I'm trying to find the seven tallest peaks from a matrix whose dimension is 8192X8192. I'm using the following programm:
function [h,hs,w,ws]=la(MC)
for i=1:1024 %laço para determinar os picos e comprimentos dos picos
[pks{i},w{i}] = findpeaks(MC(i,:)); %'findpeaks' função que indica os picos e comprimentos dos picos.
% ATENÇÃO: Só dá para fazer isso usando cell array.
end
hs = cell2mat(pks);%Função que armazena um vetor oriundo da converção do cell array para double.
ws = cell2mat(w);%Função que armazena um vetor oriundo da converção do cell array para double.
k =size(hs);%Dimensão do vetor hs. Será usado mais a frente nos próximos laços.
h = zeros(40,1);%Valor que armazenará a maior altura realizado pela comparação.
in = zeros(40,1);%Armazenará o indice da maior altura.
b=0;
for i=1:k(1,2)% for de comparação
if 1000<hs(1,i)%Comparação
b=b+1;
h(b,1) = hs(1,i);
in(b,1) = i;
end
end
With the function findpeaks, I find too many peaks. I've thougth use the seven tallest peaks, what dou you think?

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jonas
jonas 2018-9-20
编辑：jonas 2018-9-20
What do you mean highest peaks? Highest prominence? Highest peak value?
The syntax of findpeaks is the following:
[Peaks,Locs,Width,Prom]=findpeaks(x)
The output variables store the peak values, their index, their width and their prominence. Let's say you find n>7 peaks, but you are only interested in the 7 tallest ones, based on their peak value. Let's extract those
[nPeaks,id]=maxk(peaks,7)
and their locations
[nLocs]=Locs(id)
Simple as that. If you are interested in the maximum prominence, just adjust the code accordingly.

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