MATLAB: Binary Vector Frequency of 1’s

binaryfrequencymatlab function

I am trying to create a function which gives me the result of running frequency of 1's in a single generated vector of size N=100.For example if N=4, and the vector b=[0 1 0 1],then the running frequency of 1's [0 0.5 0.3333 0.5] because the frequency of 1's until the first bit is 0. How can i write this function ?

Best Answer

b = your row vector of 1's and 0's
result = cumsum(b) ./ (1:numel(b));

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MATLAB: How can i compute a running frequency of 1s in a vector

You are close, however you may be over-thinking it.

This works:

b = [0 1 0 1];
Out = cumsum(b)./(1:numel(b))
Out =
         0    0.5000    0.3333    0.5000

MATLAB: Count 1’s in binary

If you have the Image Processing Toolbox, it's just two real lines of code, a call to regionprops and a line to extract the lengths from what regionprops returns.

% Create sample binary data.
binaryArray = [0 0 1 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1]
% Measure lengths of stretches of 1's.
measurements = regionprops(logical(binaryArray), 'Area');
% Convert from structure to simple array of lengths.
allLengths = [measurements.Area]
% If you want 0's in between for some reason:
out = zeros(1, 2*length(allLengths)+1);
out(2:2:end) = allLengths

5000 numbers is no problem. This code can handle millions of them.

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Related Solutions

MATLAB: How can i compute a running frequency of 1s in a vector

MATLAB: Count 1’s in binary

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