[R] accessing information in data.frame

[Uwe Ligges]

"Dr. Berthold Kramm" wrote:
> 
> After reading a data.frame using, such as a <- read.spss("data.sav")
> I want to give the column index 'i', or a[i] to a function, which after
> some calculation, should print out the results to the standard output.
> 
> I am struggling how to access the data itself, as e.g. sum(a[i]) 

 sum(a[,i])

> does
> not work in this context. In addition I need to know the name of the
> variable within the function in order to generate a meaningful output,
> and  have not found any way to obtain the name of the variable.

 deparse(substitute(x))

Uwe Ligges
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