Just the ranks

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Just the ranks

Steve Jones - SSC Editor

SSC Guru

Points: 736212
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October 9, 2018 at 8:28 pm

#77285

Comments posted to this topic are about the item Just the ranks

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Stewart "Arturius" Campbell SSC Guru Points: 72625 More actions · Answer 1

That is really interesting , thanks Steve
Learned something new today...

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Space, the final frontier? not any more...
All limits henceforth are self-imposed.
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HappyGeek SSCoach Points: 18729 More actions · Answer 2

Now that was unexpected! Learned something new, thanks Steve.

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palotaiarpad SSCertifiable Points: 5617 More actions · Answer 3

Would never guess. It seams to be illogical for me. 🙂

Shayn Thomas SSCertifiable Points: 5863 More actions · Answer 4

nice question, thanks

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Mighty SSCrazy Eights Points: 9063 More actions · Answer 5

I think the answer or in fact, the explanation is incorrect and/or incomplete.
My assumption is that the the numbers between the brackets are first "calculated", and then the following logic is applied:

If the 0 > "calculated" <= number of columns: return column["calculated"].
If the -(number of columns) >= "calculated" < 0: return all columns, but exclude "calculated".
if "calculated" = 0: return nothing.
if "calculated" > number of columns: error undefined column.
if "calculated" < -(number of columns): return all columns.

So:

HR.hitter[1-3] = HR.hitter[-2] => return all columns except for column 2.
HR.hitter[1-2-3] = HR.hitter[-4] => return all columns.

Steve Jones - SSC Editor SSC Guru Points: 736212 More actions · Answer 6

I don't quite know how this works. It was surprising to me as well. i suspect this is some strange holdever from the past, perhaps some poorly designed behavior in the language. I could do HR[.1:3], or I've seen HR[,c(1,3)] as well.

Can't test this now, but I think there are lots of ways. I thought this was interesting, because I would assume 1-3 is the range.