R help - Nov 2013 - data manipulation

Hi everyone.
I have a list like this:
neutral_classes = list(A = 71:100, B = 46:70, C = 21:45, D = 0:20)
and I'm trying to return the letter of the named vector for with an integer
belong. For example, B if I use the value 50.
Any help would be greatly appreciated.
Regards,Phil 		 	   		  
	[[alternative HTML version deleted]]

I think a list is the wrong structure,
a vector would be better since you can
use 'match':

# transform data structure:
neutralVec <- unlist(neutral_classes)

names(neutralVec) <- 
names(neutral_classes[rep(1:length(neutral_classes), 
sapply(neutral_classes, length))]

# get one or more results with 'match':
names(neutralVec[match(c(50, 20, 10, -4), neutralVec)])

# result:
# [1] "B" "D" "D" NA


Pat


On 22/11/2013 16:58, philippe massicotte wrote:
> Hi everyone.
> I have a list like this:
> neutral_classes = list(A = 71:100, B = 46:70, C = 21:45, D = 0:20)
> and I'm trying to return the letter of the named vector for with an
integer belong. For example, B if I use the value 50.
> Any help would be greatly appreciated.
> Regards,Phil 		 	   		
> 	[[alternative HTML version deleted]]
>
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Hi,
You could use either:
names(which(sapply(lapply(neutral_classes,`%in%`,50),any)))
#[1] "B"


#or
vec1 <-unlist(neutral_classes)
?names(vec1) <- gsub("\\d+","",names(vec1))
?names(vec1)[vec1==50]
#[1] "B"



A.K.


Hi everyone. 
I have a list like this: 
neutral_classes = list(A = 71:100, B = 46:70, C = 21:45, D = 0:20) 
and I'm trying to return the letter of the named vector for with an integer
belong. For example, B if I use the value 50.
Any help would be greatly appreciated. 
Regards,Phil 		 	 ? 		 ?