Hello,
Inline.
Às 14:50 de 03/01/2019, Benoit Galarneau escreveu:
Hi everyone,
I'm new to the R world.
Probably a newbie question but I am stuck with some concept with data
frame.
I am following some examples in the "Hands-On Programming with R".
In short, how can I access/filter items in a data frame using a variable.
One example consists of manipulating elements from a deck of card:
deck
face suit value
1 king spades 13
2 queen spades 12
3 jack spades 11
4 ten spades 10
etc.
Let's say I want to remove or filter out the first card. I know I could
do deck[-1].
No, to filter out the first card you need a comma after the -1.
deck[-1, ] # filter the first row out
deck[-1] # filter the first column out
But let's say I have: topCard <- deck[1,]
topCard is then a list of 3 elements
topCard
face suit value
1 king spades 13
My question is the following, how can I remove or filter out the deck
using the topCard variable.
merge(topCard, deck, all.x = TRUE, all.y = FALSE)
Hope this helps,
Rui Barradas
In my programmer's head, something similar to this should "work":
deck[10,]
face suit value
10 four spades 4
aCard <- deck[10,]
aCard
face suit value
10 four spades 4
deck[aCard]
Error in `[.default`(deck, aCard) : invalid subscript type 'list'
Wihout having to specify all elements in the logical tests.
deck[deck$face == aCard$face & deck$suit == aCard$suit & deck$value ==
aCard$value,]
face suit value
10 four spades 4
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
