CODEWITHSUNDEEP
rvariablesframe
amitjo
amitjo

Reputation: 61

Indirect accessing of data frame variable in R

I have an R data.frame object called x. From R console when I do str(x), following is what I get.

str (x)

'data.frame':   2776 obs. of  4 variables:



$ Date   : Factor w/ 4018 levels "2003-01-01","2003-01-02",..: 1 6 11 16 21 26 31 36 41 46 ...

 $ sulfate: num  NA NA NA NA NA NA NA NA NA NA ...

 $ nitrate: num  NA NA NA NA NA NA NA NA NA NA ...

 $ ID     : int  1 1 1 1 1 1 1 1 1 1 ...

I now want to access values related to a particular variable. In that process when I do x.$nitrate I get the values corresponding to that variable (ie nitrate) properly however when I do following

> frame_variable <- "nitrate"

and then do

> x$frame_variable I get NULL

This limitation is prohibiting me to use this feature in a function that I'm trying to create. Could somebody help here.

Thanks.

Upvotes: 0

Views: 1241

Answers (1)

Nick DiQuattro
Nick DiQuattro

Reputation: 739

This is a way to access columns with a variable:

x[, frame_variable]

Upvotes: 3

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