Hi Jorge,
I could use subset(). But, I wanted to minimize coding.
Thanks,
Pradip
________________________________________
From: Jorge I Velez [jorgeivanve...@gmail.com]
Sent: Friday, November 23, 2012 10:02 PM
To: Muhuri, Pradip (SAMHSA/CBHSQ)
Cc: r-help@r-project.org
Subject: Re: [R] subsetting - questions
Hi Pradip,
It is easier to use subset(). Check ?subset for some examples and pay special
attention to the "select" parameter. By the way, do not call your data "df" as
it is already a function.
Best,
Jorge.-
On Sat, Nov 24, 2012 at 1:55 PM, Muhuri, Pradip (SAMHSA/CBHSQ) <> wrote:
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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