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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
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.
This document was generated by root on April, 26 2012 using texi2html 1.76.