Some kind of inverse of "names"

Is this what you want?:

li <- list(a=1, b=2, c=3, d=4)
li

$a
[1] 1
$b
[1] 2
$c
[1] 3
$d
[1] 4

unlist(li)

a b c d 
1 2 3 4

unname(unlist(li))

[1] 1 2 3 4

Regards
S?ren


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Julio Sergio Santana
Sent: 21. august 2012 00:20
To: r-help at r-project.org
Subject: [R] Some kind of inverse of "names"

I wonder if there exists some kind of inverse of the "names" primitive in R. Let me explain what do I mean:

If I create a list:
  -> li <- list(a=1, b=2, c=3, d=4)
then I can have:
  -> names(li)
  [1] "a" "b" "c" "d"
which is, I guess, some kind of vector, since
  -> typeof(names(li))
  [1] "character"
however, I haven't seen something that allows me to get the other side, i.e., the values.
Something like:
  ->VALUES(li)
  [1] 1 2 3 4

Do you have any comments on this?


Thanks,
  - Sergio.


______________________________________________
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Inline

-- Bert

On Mon, Aug 20, 2012 at 3:19 PM, Julio Sergio Santana

I wonder if there exists some kind of inverse of the "names" primitive in
R. Let me explain what do I mean:

If I create a list:
  -> li <- list(a=1, b=2, c=3, d=4)
then I can have:
  -> names(li)
  [1] "a" "b" "c" "d"
which is, I guess, some kind of vector, since
  -> typeof(names(li))
  [1] "character"
however, I haven't seen something that allows me to get the other side,
i.e., the values.
Something like:
  ->VALUES(li)
  [1] 1 2 3 4

Do you have any comments on this?

Yes. Read "An Introduction to R" . You do not understand lists. Also see ?unlist

-- Bert

Thanks,
  - Sergio.

        [[alternative HTML version deleted]]

______________________________________________
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and provide commented, minimal, self-contained, reproducible code.

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
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Hi Sergio,
'names' are just an attribute of your list.
If all elements of your list are of the same type (i.e. integer in your 
example) you may try something like 'unlist (li)' or even 
'as.numeric(unlist(li))'.
This will give you the values you wanted.
An other approach is organizig your data not as a list but as a named 
vector by simply using concatenate:

li <- c(a=1, b=2, c=3, d=4)

This will create a named integer vector (at least I think so) and you 
will receive the data by calling 'li'.
Hope this helped you a little.
Peter

Am 21.08.2012 00:19, schrieb Julio Sergio Santana:

I wonder if there exists some kind of inverse of the "names" primitive in
R. Let me explain what do I mean:

If I create a list:
   -> li <- list(a=1, b=2, c=3, d=4)

then I can have:
   -> names(li)
   [1] "a" "b" "c" "d"
which is, I guess, some kind of vector, since
   -> typeof(names(li))
   [1] "character"
however, I haven't seen something that allows me to get the other side,
i.e., the values.
Something like:
   ->VALUES(li)
   [1] 1 2 3 4

Do you have any comments on this?


Thanks,
   - Sergio.

	[[alternative HTML version deleted]]

______________________________________________
R-help at 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.

Institute of Earth and Environmental Sciences, University of Potsdam
Karl-Liebknecht-Str. 24/25 (House 12), 14476 Potsdam, Germany
office: +49 331 977 2469
mobile: +49 173 3732867
e-mail: peter.vorpahl at uni-potsdam.de

S?ren H?jsgaard <sorenh <at> math.aau.dk> writes:

Is this what you want?:

Yes, that is exactly what I wanted!
Thanks,

--Sergio.

Hi Sergio,
'names' are just an attribute of your list.
If all elements of your list are of the same type (i.e. integer in your 
example) you may try something like 'unlist (li)' or even 
'as.numeric(unlist(li))'.
This will give you the values you wanted.
An other approach is organizig your data not as a list but as a named 
vector by simply using concatenate:

li <- c(a=1, b=2, c=3, d=4)

This will create a named integer vector (at least I think so) and you 
will receive the data by calling 'li'.
Hope this helped you a little.
Peter

Am 21.08.2012 00:19, schrieb Julio Sergio Santana:

I wonder if there exists some kind of inverse of the "names" primitive in
R. Let me explain what do I mean:

If I create a list:
   -> li <- list(a=1, b=2, c=3, d=4)
then I can have:
   -> names(li)
   [1] "a" "b" "c" "d"
which is, I guess, some kind of vector, since
   -> typeof(names(li))
   [1] "character"
however, I haven't seen something that allows me to get the other side,
i.e., the values.
Something like:
   ->VALUES(li)
   [1] 1 2 3 4

Do you have any comments on this?


Thanks,
   - Sergio.

	[[alternative HTML version deleted]]

______________________________________________
R-help at 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.