How can I work out the median of frequency tables?

I currently have vector A that contains an ordered range of values, and vector B that contains the corresponding frequencies of these values.

What would I need to do in order to discover the median of the values in vector A, based on the frequencies in vector B?

Answer 1

[Star Strider]

I would use the frequency vector ‘B’, since it has the information you need.

Try this:

A = sort(rand(1, 35));                              % Create ‘A’
B = randi(99, size(A));                             % Create ‘B’

Bcsn = cumsum(B)/sum(B);                            % Normalised Frequency Vector
median_idx = find(Bcsn <= 0.5, 1, 'last');          % Index Of Normalised Frequencies <= 0.5
A_median = A(median_idx);                           % Corresponding Element Of ‘A’

[Matthew Quigley]

This works as intended, thank you!

[Star Strider]

As always, my pleasure!