matlab - count equal adjacent element of array -

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this question has answer here:

i've vector 

a = [0;1;1;1;0;0;1;1;1;2;2;2;2];

and want count number of equal adjacent values in order have matrix this:

b=[0 1    1 3    0 2    1 3    2 4];

can me?

here short solution:

j=find(diff([a(1)-1; a])); b=[a(j), diff([j; numel(a)+1])];

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