Re: [R] Subset based on multiple values
Hi, Try this: (a variant of andrija) testct-table(test) subset(test,!is.na(match(test,as.integer(names(testct[testct%in%max(testct)]) [,1] [1,] 1 [2,] 1 [3,] 1 [4,] 1 [5,] 7 [6,] 7 [7,] 7 [8,] 7 A.K. - Original Message - From: Amanduh320 aadam...@uwo.ca To: r-help@r-project.org Cc: Sent: Wednesday, July 11, 2012 2:33 PM Subject: [R] Subset based on multiple values I'm stuck on a seemingly simple problem. I'm trying to subset the data by several numbers and it cuts out half of the rows. Here is the sample code: test - as.matrix(c(1,1,1,1,3,3,7,7,7,7)) Count - tapply(test[,1], test[,1], length) # count for each value spp - unique(test[,1]) Count1 - as.data.frame(cbind(Count,spp)) Max - max(Count) Count1$sppMax - ifelse(Count1$Count = Max, Count1$spp, 0) # only keep values that =Max Count2 - subset(Count1, sppMax 0) #get rid of values that are less than Max AllMax - unique(Count2$sppMax) test2 - subset(test, test[,1] == AllMax) this works where there is only one value for AllMax, how to make it work when there are multiple? Thank you! -- View this message in context: http://r.789695.n4.nabble.com/Subset-based-on-multiple-values-tp4636159.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. __ 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.
[R] Subset based on multiple values
I'm stuck on a seemingly simple problem. I'm trying to subset the data by several numbers and it cuts out half of the rows. Here is the sample code: test - as.matrix(c(1,1,1,1,3,3,7,7,7,7)) Count - tapply(test[,1], test[,1], length) # count for each value spp - unique(test[,1]) Count1 - as.data.frame(cbind(Count,spp)) Max - max(Count) Count1$sppMax - ifelse(Count1$Count = Max, Count1$spp, 0) # only keep values that =Max Count2 - subset(Count1, sppMax 0)#get rid of values that are less than Max AllMax - unique(Count2$sppMax) test2 - subset(test, test[,1] == AllMax) this works where there is only one value for AllMax, how to make it work when there are multiple? Thank you! -- View this message in context: http://r.789695.n4.nabble.com/Subset-based-on-multiple-values-tp4636159.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] Subset based on multiple values
I see that this is your input: c(1,1,1,1,3,3,7,7,7,7) what do you want the output to be? what could the multiple values of AllMax be? - Yasir Kaheil -- View this message in context: http://r.789695.n4.nabble.com/Subset-based-on-multiple-values-tp4636159p4636167.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] Subset based on multiple values
Hi. Maybe this: ct - table(test) as.numeric(names(ct[ct==max(ct)])) test[test[,1]%in%as.numeric(names(ct[ct==max(ct)])),,drop=FALSE] ? Andrija On Wed, Jul 11, 2012 at 8:33 PM, Amanduh320 aadam...@uwo.ca wrote: I'm stuck on a seemingly simple problem. I'm trying to subset the data by several numbers and it cuts out half of the rows. Here is the sample code: test - as.matrix(c(1,1,1,1,3,3,7,7,7,7)) Count - tapply(test[,1], test[,1], length) # count for each value spp - unique(test[,1]) Count1 - as.data.frame(cbind(Count,spp)) Max - max(Count) Count1$sppMax - ifelse(Count1$Count = Max, Count1$spp, 0) # only keep values that =Max Count2 - subset(Count1, sppMax 0)#get rid of values that are less than Max AllMax - unique(Count2$sppMax) test2 - subset(test, test[,1] == AllMax) this works where there is only one value for AllMax, how to make it work when there are multiple? Thank you! -- View this message in context: http://r.789695.n4.nabble.com/Subset-based-on-multiple-values-tp4636159.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. [[alternative HTML version deleted]] __ 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] Subset based on multiple values
I want the output to be 1,1,1,1,7,7,7,7
The multiple values of AllMax are 1 and 7.
I think I've figured it out though, I added a loop at the end:
test - as.matrix(c(1,1,1,1,3,3,7,7,7,7))
Count - tapply(test[,1], test[,1], length) # count for each value
spp - unique(test[,1])
Count1 - as.data.frame(cbind(spp,Count))
Max - max(Count1$Count)
Count1$sppMax - ifelse(Count1$Count = Max, Count1$spp, 0) # only keep
values that =Max
Count2 - subset(Count1, sppMax 0)#get rid of values that are less
than Max
AllMax - unique(Count2$sppMax)
test2 - test[0,] # set up the blank header, same format as test2
for(i in 1:length(AllMax)) { # run 1 round of the loop for each value
in the vector AllMax
tempset - subset(test, test[,1] == AllMax[i]) #subset all the values
in test2 column 1 that match the current value in the AllMax
test2 - rbind(test2,tempset) # bind the subset with the blank header
(first round of the loop) or with subsets from previous values of AllMax
(subsequent rounds)
}
--
View this message in context:
http://r.789695.n4.nabble.com/Subset-based-on-multiple-values-tp4636159p4636176.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] Subset based on multiple values
yes just use %in% instead of == AllMax.. but also use table for count - Yasir Kaheil -- View this message in context: http://r.789695.n4.nabble.com/Subset-based-on-multiple-values-tp4636159p4636183.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.
