Question

I want to select all columns in my dataframe which I have stored in a string variable. For example:

v1 <- rnorm(100)
v2 <- rnorm(100)
v3 <- rnorm(100)
df <- data.frame(v1,v2,v3)

I want to accomplish the following:

df[,c('v1','v2')]

But I want to use a variable instead of (c(‘v1’, ‘v2’))(these all fail):

select.me <- "'v1','v2'"
df[,select.me]
df[,c(select.me)]
df[,c(paste(select.me,sep=''))]

Thanks for help with a simple question,

Answer 1

This is basic R sytnax, perhaps you need to read the introductory manual

select.me <- c('v1','v2')
df[,select.me]