In Chapter "Vector arithmetic":
------------------
constant is simply repeated. So with the above assignments the command
> v <- 2*x + y + 1
------------------
yields a
> v <- 2*x + y + 1
Warning message:
longer object length
is not a multiple of shorter object length in: 2 * x + y
This is because
> x
[1] 10.4 5.6 3.1 6.4 21.7> y
[1] 10.4 5.6 3.1 6.4 21.7 0.0 10.4 5.6 3.1 6.4 21.7
Because one example was "y <- c(x, 0, x).
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