Total number of zeros , ones , twos..etc in a matrix

I have a matrix where in the fourth column there will be numbers of 0 to 23. I need a separate matrix where there will be the total numbers of 0s, 1s,2s ..23s etc. Say there will be 1000 0s, 3000 1s 24000 11s etc.

[Elimelech Schreiber]

histcounts()

https://www.mathworks.com/help/matlab/ref/histcounts.html

specifically for your problem:

histcounts(x(:,4), (-1:max(x(:,4)))+0.5)

[Walter Roberson]

accumarray() together with findgroups(). Or use groupcounts()

I will not post code as I have a suspicion this is homework.

Answer 1

[KSSV]

Let a be your data array.

[count_unique, unique_a] = hist(a,unique(a)) ;

[Joydeb Saha]

thank you KSSV