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I'm reading a book on R and I don't understand the behavior of the seq function. Can someone please explain to me what it's doing when you give it a vector such as what is shown below on line 4?

> seq(1,5,1)
[1] 1 2 3 4 5
> x <- c(1,5,1)
> seq(x)
[1] 1 2 3
vitalious
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1 Answers1

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seq generates a sequence basically, so:

seq(from, to, increment)

printed out 1 to 5 incrementing by 1 each time.

Then the c function combines lists or vectors. So it has added the variables to x and then seq is performed on x which by default calls seq_len which outputs a sequence of 1 to length(x).

Check the documenation in the links below to see the default methods.

Sequence generation: seq
Combine/concatenate: c

thelatemail
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SharpCode
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    Incomplete answer to the question. –  Jan 28 '15 at 04:59
  • No its not lol, geez people are so quick to downvote. cheers. anyway @vitalious check out the links for a much more detailed explanation. – SharpCode Jan 28 '15 at 05:03