Question

If you have a MATLAB array such as the below:

A = [1,1,1,1,2,2,2,2,3,3,3,4,4,5]

I want to be able to filter this array so that elements which have a low frequency are removed.

In other words, is there an easy way to remove elements in the array which have a certain low frequency for example <= than 2?

In this case:

The result would be:

[1,1,1,1,2,2,2,2,3,3,3]

Cheers

Answer 1

I’d probably do it somehow like this (hope the syntax is good :))

function array= ClearElementsWithLowOccurence(array,minimalFrequency)
elements = unique(array);
indecesToRemove = [];
for i = 0:length(elements)
   indeces = find(array==elements(i));
   if (length(indeces) < minimalFrequency)
      indecesToRemove = [indecesToRemove indeces];
   end;
end;
array(indecesToRemove) = [];