One liner wanted: Create data frame and give colnames: R data.frame(…, colnames = c(“a”, “b”, “c”))

Question

Is there an easier (i.e. one line of code instead of two!) way to do the following:

results <- as.data.frame(str_split_fixed(c(\"SampleID_someusefulinfo.c         


        

Answer 1

We can use the dimnames option in matrix as the OP was using matrix to create the data.

data.frame(matrix(1:4, 2, 2, dimnames=list(NULL, c("a", "b"))))

Or

`colnames<-`(data.frame(matrix(1:4, 2, 2)), c('a', 'b'))

Answer 2

Use setNames() around a data.frame

setNames(data.frame(matrix(c(1,2,3,4),nrow=2,ncol=2)), c("a","b"))
#  a b
#1 1 3
#2 2 4

---

?setNames:

a convenience function that sets the names on an object and returns the object

> setNames
function (object = nm, nm) 
{
    names(object) <- nm
    object
}