values in falling in each histogram bin

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zozo 2012-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/46438-values-in-falling-in-each-histogram-bin

Hello,

sig=randn(1,440); %random data set
bin1=round(1+log2(size(sig,2))); %optimal number of bins
edges = linspace(min(sig), max(sig), bin1+1);
bins = (edges(1:end-1) + edges(2:end))/2;
[counts,binIdx] = histc(sig, edges); %bin count
counts(end) = [];  %remove the additional added bin                     
binIdx(binIdx==bin1+1) = bin1; %set the index
figure; hist(sig,bin1) %plot histogram

How do I find the values of sig falling in each bin? My final goal is to have only those values from 'sig' in a variable which are below a count of (say 20) in the histogram.

please help

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回答（1 个）

José-Luis 2012-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/46438-values-in-falling-in-each-histogram-bin#answer_56816

在 MATLAB Online 中打开

sig=randn(1,440); %random data set
bin1=round(1+log2(size(sig,2))); %optimal number of bins
edges = linspace(min(sig), max(sig), bin1+1);
bins = (edges(1:end-1) + edges(2:end))/2;
[n,xOut]= hist(sig,bins); %or use histc if you want to specify the edges.

n is the vector of values you are looking for.

Cheers!

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José-Luis 2012-8-22

在 MATLAB Online 中打开

sig=randn(1,440); %random data set
bin1=round(1+log2(size(sig,2))); %optimal number of bins
edges = linspace(min(sig), max(sig), bin1+1);
bins = (edges(1:end-1) + edges(2:end))/2;
PointsInBin = cell(length(edges) - 1,1);
PointsInBin(1) = {sig(sig>= edges(1) & sig<=edges(2))};
for  k = 3:length(edges)
PointsInBin(k-1) = {sig(sig>edges(k-1) & sig <= edges(k))};
end

zozo 2012-8-22

编辑：zozo 2012-8-22

在 MATLAB Online 中打开

@Jose: Thank you. I have simplified it further:

sig=randn(1,440); %random data set
bin1=round(1+log2(size(sig,2))); %optimal number of bins
edges = linspace(min(sig), max(sig), bin1+1);
bins = (edges(1:end-1) + edges(2:end))/2;
[n,whichbin]= histc(sig,edges);
PointsInBin=cell(length(edges)-1,1);
for k=1:bin1
    flagBinMem=(whichbin==k);
    PointsInBin(k)={sig(flagBinMem)};
end