This may not be exactly what the OP wanted, but it may be easier
to plow the original vectors a and b thru something like
> alogic <-rle(!is.na(as.logical(a)))
which returns a bunch of lengths and strings of TRUEs and FALSEs .
Then play with alogic and blogic (created similarly to alogic),
comparing to or multiplying them by a and b, and so on.
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