这个空间从哪里来？cat（）

Question

If i run:

r_2 = 0.89 # (wow that's an impressive R^2)
rmse = 24724.58
cat("R^2: ", r_2, '\n',"RMSE: ", rmse)

in the RStudio Console it returns:

R^2:  0.89 
 RMSE:  24724.58

is it obvious why there's an extra space before RMSE ?

Answer 1

Yes, that's due to the sep argument of cat :

sep - a character vector of strings to append after each element.

cat("R^2: ", r_2, '\n', "RMSE: ", rmse, sep = "")
# R^2: 0.89
# RMSE: 24724.58