How do i select in a concise way a group of columns in a data set in R

Question

Hi i am trying to do this but in a vast data frame with hundreds of columns is there a more concise was of doing this method: df[,c(1,2,3,4,etc)] i need to write code for column 1-413 then 413- something else so it is just a range and not an assortment like [,c(1,2,5)] thanks

Answer 1

We can use : instead of -

subdf <- df[2:414]

If we need the rowwise median

apply(subdf, 1, median, na.rm = TRUE)

Or with matrixStats

library(matrixStats)
rowMedians(as.matrix(subdf), na.rm = TRUE)