Counting the number of occurences for specific values in an array

I have an array that reads [ 1 2 3 4 5 5 4 3 2 1 ] and I want to count the number of occurences of each element

so that it gives me an array of [ 2 2 2 2 2 ]

I tried using

x(i)=sum[array(i)==array] but it gives me [ 2 2 2 2 2 2 2 2 2 2 2 ]

Answer 1

[Rik]

a=[ 1 2 3 4 5 5 4 3 2 1 ] ;
histcounts(a)

If you have non-integer data you can use the unique function to convert your vector to positive integers.