Using columns with special characters in formulae in R

Question

I\'m trying to make a decision tree using rpart using a data frame that has ~200 columns. Some of these columns have numbers in their names, some have special characters (e.

Answer 1

This works:

dat <- data.frame(M=rnorm(10),'A/B'=1:10,check.names=F)

> lm(M~`A/B`,dat)

Call:
lm(formula = M ~ `A/B`, data = dat)

Coefficients:
(Intercept)        `A/B`  
    -1.0494       0.1214