Hi Arun,
Thank you so much for your help.
Pradip
________________________________________
From: arun [smartpink...@yahoo.com]
Sent: Friday, November 23, 2012 10:15 PM
To: Muhuri, Pradip (SAMHSA/CBHSQ)
Cc: R help
Subject: Re: [R] subsetting - questions
HI,
This should work:
df[df$X1>=8,][-which(names(df)%in% c("X3","X4","X5"))]
# X1 X2
#1 8 2
#5 10 1
#8 8 5
#9 9 4
#12 9 5
#13 9 10
#19 9 8
df[df$X1>=8,][,!names(df)%in%drop_var]
# X1 X2
#1 8 2
#5 10 1
#8 8 5
#9 9 4
#12 9 5
#13 9 10
#19 9 8
A.K.
----- Original Message -----
From: "Muhuri, Pradip (SAMHSA/CBHSQ)" <pradip.muh...@samhsa.hhs.gov>
To: "r-help@r-project.org" <r-help@r-project.org>
Cc:
Sent: Friday, November 23, 2012 9:55 PM
Subject: [R] subsetting - questions
Hello,
I have two very basic questions (console attached):
1) What am I getting an error message for # 5 and # 7 ?
2) How to fix the code?
I would appreciate receiving your help.
Thanks,
Pradip Muhuri
###### Reproducible Example #####
N <- 100
set.seed(13)
df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))
keep_var <- c("X1", "X2")
drop_var <- c("X3", "X4", "X5")
df[df$X1>=8,] [,1:2] #1
df[df$X1>=8,] [,-c(3,4,5)] #2
df[df$X1>=8,] [,c(-3,-4,-5)] #3
df[df$X1>=8,] [,c("X1", "X2")] #4
df[df$X1>=8,] [,-c("X3", "X4", "X5")] #5 DOES NOT WORK
df[df$X1>=8,] [,keep_var] #6
df[df$X1>=8,] [, !drop_var] #7 DOES NOT WORK
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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.
