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

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Tyron Louw 2018-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/411934-how-do-i-count-the-number-of-new-occurrences-of-a-number-in-an-array

关闭： MATLAB Answer Bot 2021-8-20

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!