[R] Data.frames : difference between x$a and x[, "a"] ? - How set new values on x$a with a as variable ?

[omerle]

Hi,

I got two questions :

1st Question
            a="S"
            b=data.frame(S=3)
            do.call(`<-`,list(do.call(`$`,list(b,"S")),5))
=> How can I put new values on S column having the column name as a variable ?

2 nd Question
       a="S"
       b=data.frame(S=3)
       b[,"S"]=list(1:10) #Doesnt works
       b$S=list(1:10) #Works
=> Isnt the same thing ? What is the difference between these two things ?


Thanks,

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