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How do I count the number of new occurrences of a number in an array?

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Tyron Louw
Tyron Louw on 24 Jul 2018
Closed: MATLAB Answer Bot on 20 Aug 2021
I have an array given as
x = [1 1 1 1 1 1 1 2 2 1 1 1 3 3 3 3 1 1 1 1 3 1 5]
I am trying to calculate how many new occurrences there are of the number 1. Importantly, this should ignore whether or how many times 1 recurs in the adjacent cell. In the above example, the answer would be 4, because there are 4 instances of 1 appearing, even though they differ in length.
Thanks!

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