MATLAB: How can i calculate how many number of times that 1 occurs.

Question

I have an array like this

x =

     1     2     3     4
     1     2     3     4
     1     2     3     4
     1     2     3     4

how can i calculate how many number of times that 1 occurs.

Answer 1

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

%or

out=nnz(x==1)