[R] Accessing a field in a data fram

[R_Learner]

raw <- read.csv(file=filename, head=TRUE,sep=",") 

I've read in a csv file, and I'm looking to access a column whose name is
held in a string.

For example, I want to access raw$one or raw$two, but this will depending on
the string. Let's say that the string is decision<-"one". How would I access
raw$one?

The following doesn't work:
numbers<-raw$decision

Please help me!
Thanks!
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