Binning in matlab

Question

I have been unable to find a function in matlab or octave to do what I want. I have a matrix m of two columns (x and y values). I know that I can extract the column by doing m(

Answer 1

I have answered this in video form on my blog:

http://blogs.mathworks.com/videos/2009/01/07/binning-data-in-matlab/

Here is the code:

m = rand(10,2); %Generate data

x = m(:,1); %split into x and y
y = m(:,2);

topEdge = 1; % define limits
botEdge = 0; % define limits
numBins = 2; % define number of bins

binEdges = linspace(botEdge, topEdge, numBins+1);

[h,whichBin] = histc(x, binEdges);

for i = 1:numBins
    flagBinMembers = (whichBin == i);
    binMembers     = y(flagBinMembers);
    binMean(i)     = mean(binMembers);
end