MATLAB: How to create a histogram with weighted values from an array

arrayshistogramMATLABweighting values

Hi all,
I am relatively new to MatLab so I need some assistance with this task. Basically, I have two arrays that I want to weigh the other with and create an overall histogram. To explain this better, I have an array that contains the bins (A) and an array with weighted values (B):
A = [70 90 80; 90 90 90; 80 60 70]
B = [0.5 0.8 1.0; 0.2 0.5 1.0; 0.3 0.2 0.5]
Ultimately, I want my bin counts to be:
60 bin: 0.2 70 bin: 1.0 80 bin: 1.3 90 bin: 2.5
Is there a way to use the A array to classify the weighted counts of array B and create a histogram?
Thanks in advance!

Best Answer

This will do it (though there might well be a neater way!):
A = [70 90 80; 90 90 90; 80 60 70];
B = [0.5 0.8 1.0; 0.2 0.5 1.0; 0.3 0.2 0.5];
A = A(:); B = B(:); C = sortrows([A B]);
k = 0;
for i = 60:10:90
    ix = C(:,1)==i;
    k = k+1;
    bin(k) = sum(C(ix,2));
    ix = [];
end
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