Re: [R] how to eliminate an element of a list
Hello André,
I want to eliminate an element of a list:
list - seq(1,5,1)
That's not a list, it's a vector
s - sample(list,1)
lets say s=3
Now I want to remove 3 from the list: list2 = {1,2,4,5}
If all values are unique as in your example, this will work
x - 1:5
s - sample(x, 1)
x - x[ x != s ]
The last step could also be...
x - x[ -match(s, x) ] # note minus sign
Lots of other was to do it too.
Note, I'm assuming you won't always have values equal to the element indices.
Michael
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Re: [R] how to eliminate an element of a list
list-seq(2,10,2) list [1] 2 4 6 8 10 list[-which(2==list)] [1] 4 6 8 10 using the which() will let you remove things from a list that have a specified value... I usually use the blah- blah[-which(TRUE==is.na(blah)) ] which will remove all NA values in your list -- View this message in context: http://r.789695.n4.nabble.com/how-to-eliminate-an-element-of-a-list-tp2323329p2324696.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list 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.
Re: [R] how to eliminate an element of a list
Try to do this list - seq(1,5,1) list-list[-3] list [1] 1 2 4 5 list[-x] will remove the xth value in your list. Also you can do something like list[-c(1:4)] [1] 5 To remove values at indexes 1-4 list[-c(1,4)] [1] 2 3 5 To remove values at indexes 1 and 4 -- View this message in context: http://r.789695.n4.nabble.com/how-to-eliminate-an-element-of-a-list-tp2323329p2324691.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list 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.
Re: [R] how to eliminate an element of a list
On Aug 13, 2010, at 4:06 PM, fishkbob wrote: list-seq(2,10,2) list [1] 2 4 6 8 10 list[-which(2==list)] [1] 4 6 8 10 using the which() will let you remove things from a list that have a specified value... I usually use the blah- blah[-which(TRUE==is.na(blah)) ] which will remove all NA values in your list Although which() is useful when used with [ because it avoids the NA indexing problem, it is entirely superfluous here. blah- blah[-is.na(blah) ] # will be more efficient -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list 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.
Re: [R] how to eliminate an element of a list
Try this:
setdiff(list, s)
On Thu, Aug 12, 2010 at 5:32 PM, André de Boer rnie...@gmail.com wrote:
Hi,
I want to eliminate an element of a list:
list - seq(1,5,1)
s - sample(list,1)
lets say s=3
Now I want to remove 3 from the list: list2 = {1,2,4,5}
Can someone give me a tip?
Thanks,
André
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Henrique Dallazuanna
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