how to NULL multiple variables of a df efficiently?
Another way is:
subset(df, select=c(var.b, var.c))
though I'd be willing to bet that using %in% is probably faster.[1] Tony [1] Unfortuantly I'm skint :-(
On 24 Feb, 20:10, Sean Zhang <seane... at gmail.com> wrote:
Dear R-helpers:
I am an R novice and would appreciate answer to the following question.
Want to delete many variables in a dataframe.
Am able to delete one variable by assigning it as NULL
Have a large number of variables and would like to delete them without using
a for loop.
Is there a command/function which does this job?
Many thanks in advance.
-Sean
#Small Example:
df<-data.frame(var.a=rnorm(10), var.b=rnorm(10),var.c=rnorm(10))
df[,'var.a']<-NULL ? #this works for one single variable
df[,c('var.a','var.b')]<-NULL ?#does not work for multiple variables
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