R help - Mar 2014 - Data Frame to list?

Folks,

I have a data frame as follows:
> foo<-structure(list(name = c("A", "B",
"C"), num = c(3L, 2L, 1L)), .Names = c("name",
"num"), row.names = c(NA, -3L), class = "data.frame")
> str(foo)
'data.frame':   3 obs. of  2 variables:
 $ name: chr  "A" "B" "C"
 $ num : int  3 2 1
> foo
  name num
1    A   3
2    B   2
3    C   1

I want to convert this to a list like so:
> oof<-list(A = 3, B = 2, C = 1)
> str(oof)
List of 3
 $ A: num 3
 $ B: num 2
 $ C: num 1
> oof
$A
[1] 3

$B
[1] 2

$C
[1] 1

Any Suggestions?

Thanks,
KW

--

Try:
oof1 <- list()
?oof1[foo$name] <- foo$num
A.K.




On Friday, March 7, 2014 10:43 PM, Keith S Weintraub <kw1958 at gmail.com>
wrote:
Folks,

I have a data frame as follows:
> foo<-structure(list(name = c("A", "B",
"C"), num = c(3L, 2L, 1L)), .Names = c("name",
"num"), row.names = c(NA, -3L), class = "data.frame")
> str(foo)
'data.frame':?  3 obs. of? 2 variables:
$ name: chr? "A" "B" "C"
$ num : int? 3 2 1
> foo
? name num
1? ? A?  3
2? ? B?  2
3? ? C?  1

I want to convert this to a list like so:
> oof<-list(A = 3, B = 2, C = 1)
> str(oof)
List of 3
$ A: num 3
$ B: num 2
$ C: num 1
> oof
$A
[1] 3

$B
[1] 2

$C
[1] 1

Any Suggestions?

Thanks,
KW

--

______________________________________________
R-help at r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

> oof <- as.list(foo$num)
> names(oof) <- foo$name
> oof
On Fri, Mar 7, 2014 at 10:41 PM, Keith S Weintraub <kw1958 at gmail.com>
wrote:
> Folks,
>
> I have a data frame as follows:
>
>> foo<-structure(list(name = c("A", "B",
"C"), num = c(3L, 2L, 1L)), .Names = c("name",
> "num"), row.names = c(NA, -3L), class = "data.frame")
>
>> str(foo)
> 'data.frame':   3 obs. of  2 variables:
>  $ name: chr  "A" "B" "C"
>  $ num : int  3 2 1
>
>> foo
>   name num
> 1    A   3
> 2    B   2
> 3    C   1
>
> I want to convert this to a list like so:
>
>> oof<-list(A = 3, B = 2, C = 1)
>
>> str(oof)
> List of 3
>  $ A: num 3
>  $ B: num 2
>  $ C: num 1
>
>> oof
> $A
> [1] 3
>
> $B
> [1] 2
>
> $C
> [1] 1
>
> Any Suggestions?
>
> Thanks,
> KW
>
> --
>
> ______________________________________________
> 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.

On 3/7/2014 7:41 PM, Keith S Weintraub wrote:
> Folks,
>
> I have a data frame as follows:
>
>> foo<-structure(list(name = c("A", "B",
"C"), num = c(3L, 2L, 1L)), .Names = c("name",
> "num"), row.names = c(NA, -3L), class = "data.frame")
>
>> str(foo)
> 'data.frame':   3 obs. of  2 variables:
>   $ name: chr  "A" "B" "C"
>   $ num : int  3 2 1
>
>> foo
>    name num
> 1    A   3
> 2    B   2
> 3    C   1
>
> I want to convert this to a list like so:
>
>> oof<-list(A = 3, B = 2, C = 1)
You can do it as a one-liner as well:

oof <- setNames(as.list(foo$num), foo$name)
>> str(oof)
> List of 3
>   $ A: num 3
>   $ B: num 2
>   $ C: num 1
>
>> oof
> $A
> [1] 3
>
> $B
> [1] 2
>
> $C
> [1] 1
>
> Any Suggestions?
>
> Thanks,
> KW
>
> --
>

-- 
Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University