[R] How to bold items on a data frame?

[Stephen Liu]

Hi folks,

I ran following commands to create a data file:

Year <- c(1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990)
Yield <- c(60, 50, 70, 70, 80, 50, 60, 40)
Concentration% <- c(30, 40, 50, 60, 70, 80, 90, 100)
Temperature <- c(56, 47, 53, 53, 56, 47, 44, 44)

datafile <- data.frame(Year,Yield,Concentration,Temperature)

Please advise how to bold the items, Year/Yield/etc.

TIA

B.R.
Stephen L