MATLAB: How to find the number of occurances

Question

i have a matrix x=[1 1 1 1 2 2 1 1 3 3 ]

i want the output to be x1=[1 2 1 3] and y1=[4 2 2 2]

x1 should have the reduced number from input and x2 should be the number of ocurances

Answer 1

x=[1 1 1 1 2 2 1 1 3 3];
idx=logical([diff(x)~=0,1]);
x1=x(idx)
yy=find(idx);
yyy=diff(find(idx));
y1=[yy(1) yyy]
x2=histc(x,unique(x))  % number of occurences
unique_numbers_and_their_occurences=[unique(x); histc(x,unique(x))].' %bonus

Gives:

x1 =
     1     2     1     3
y1 =
     4     2     2     2
x2 =
     6     2     2
unique_numbers_and_their_occurences =
     1     6
     2     2
     3     2