3.3.1 Recycling rules

If one tries to add two structures with a different number of elements, then the shortest is recycled to length of longest. That is, if for instance you add c(1, 2, 3) to a six-element vector then you will really add c(1, 2, 3, 1, 2, 3). If the length of the longer vector is not a multiple of the shorter one, a warning is given.

As from R 1.4.0, any arithmetic operation involving a zero-length vector has a zero-length result.

One exception is that when adding vectors to matrices, a warning is not given if the lengths are incompatible.

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