MATLAB: How to find out how many times a number apears in a 2D matrix ? which function to use

how many times it appears

Hey,

how can I find how many time a numbers appears in an 2D matrix for example:

If I have a matrix

x=[1,3,4;2,2,1;2,2,1]

number 2 appears 4 times

numger 1 appears 2 times

number 3 appears 1 time

Desired output:

22    1   3
22    1

n=2; % number to be tested 
nnz(ismember(x,n))

x=repmat(1:4,4,1) % Example
out=sum(x(:)==1)

%or

out=nnz(x==1)

x = randi(8,15,1)
a = unique(x)
number_of_frequent = histc(x,a)
out = [a number_of_frequent]