[R] how to count number of occurrences

[uka]

This was very helpful. Thank you very much. Just one question, I notice that
it does not count the number of X's before the first Y. I want the result be
1 4 0 0 0 5 0 0 0 0. I tried combining this output with the first value of
rle output, but realized that rle doesn't give me the 0s. So, if my first
observation was Y, then I want it to show that there are 0 Xs before that.
Thank you again.

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