Hello,
I want to use seq with multiple from values and am getting unexpected
(to me) behavior. I'm wondering if this behavior is intentional or not.
> seq(2, by=3, length.out=4)
[1] 2 5 8 11
> seq(3, by=3, length.out=4)
[1] 3 6 9 12
Now if I want the combined sequence, I thought I could pass in c(2,3),
and I get:
> seq(c(2,3), by=3, length.out=8)
[1] 2 6 8 12 14 18 20 24
However, the result is not what I expected (i.e. what I wanted):
[1] 2 3 5 6 8 9 11 12
It seems that this is a consequence of vector recycling during the
summation in seq.default:
if (missing(to)) from + (0L:(length.out - 1L)) * by
To get the value I want, I am using the following code:
> sort(as.vector(apply(array(c(2,3)), 1, seq, by=3,length.out=4)))
[1] 2 3 5 6 8 9 11 12
So two questions:
1. Is seq designed/intended to be used with a vector from argument, and
is this the desired behavior?
2. If so, is there a cleaner way of implementing what I want?
Thanks,
Brian
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