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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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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