[R] Formula Interpreter in R

[amit jain]

Hi All,
Before writing a simple formula intereter in R myself, i wanted to find out if any one has done it before. I could not locate it myself. I am looking for something like this - take a dataframe and a simple formula string as input and gives an output with formula applied on different columns of dataframe ( even better if it is time series compatibe)

A crude and bad example is as below
http://www.codeproject.com/KB/recipes/formulainterpreter.aspx

I will appreciate if anyone can provide any pointers/direction

Thanks