R: constructing a data frame with many columns using paste()

Question

col1 <- c(1, 2, 3)
col2 <- c(4, 5, 6)
col3 <- c(7, 8, 9)

• On the one hand data.frame(col1, col2, col3)

gives<

Answer 1

You may want to use mget

do.call(cbind, mget(paste0("col", 1:3)))

Where the paste0 generates the variable names, mget gets the associated values, and cbind puts them together into a data frame.