[R] Using apply for logical conditions

[Michael Lachmann]

Reduce() is much nicer, but I usually use

rowSums(A) > 0 for 'or', and
rowSums(A) == ncols for 'and'.

Which works slightly faster.

I noticed, though, that Reduce() doesn't work on matrices. Is there an
alternative for matrices, or do you have to convert the matrix first to a
data.frame, and then use Reduce?


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