How to find a number but if it repeats immediately after, take the first value.

I want to be able to find the index of the first 5 in but ignore the other 5's if they are immediately right after.

In the example below, there would be three 5's I would want to keep.

A = [0 5 0 5 5 0 0 0 5 5 5 5 5 0 0 0]

b = A == 5;
c = find(b == 1);

A = [0 5(keep) 0 5(keep) 5 0 0 0 5(keep) 5 5 5 5 0 0 0]

Answer 1

[Stephen23]

A = [0 5 0 5 5 0 0 0 5 5 5 5 5 0 0 0];
X = diff([false,A==5])>0

X = 1×16 logical array
   0   1   0   1   0   0   0   0   1   0   0   0   0   0   0   0

Answer 2

[Sulaymon Eshkabilov]

Here is an easy solution to your exercise:

A = [0 5 0 5 5 0 0 0 5 5 5 5 5 0 0 0];
IND = find(A==5);
C = A(IND(1:5));

Good luck.