You can use unique
in combination with histc
to get the relative frequency.
A=[1,2,3,1,2,4,2,1]; %#an example vector
unqA=unique(A);
This gives the unique elements as unqA=[1,2,3,4]
. To get the number of occurances,
countElA=histc(A,unqA); %# get the count of elements
relFreq=countElA/numel(A);
This gives countElA=[3,3,1,1]
and relFreq=[0.3750, 0.3750, 0.1250, 0.1250]
, which is the relative frequency of the unique elements. This will work for both integers and floating points.