R - Simultaneously Replacing a set of columns using 'gsub'

mgsub.R

library(ggplot2)
head(diamonds,10)
colList <- c("cut", "clarity") #list of columns to replace. Can also be column numbers.
rowstoReplace <- 1:10 
lapply(colList, function(colname){gsub("I", ".", diamonds[rowstoReplace, colname])}) 
#lapply gives it one column name at a time...
#Use a comma instead of rowstoReplace if you want all rows changed.