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2007 Jul 06
2
access to 'formula' terms in a user function
...(ultimately for some multidimensional windowing - but this question is on scripting basics). For purposes of figuring out my needs, lets just consider writing a function that takes a formula and a dataset, and outputs the mean of each variable in the formula model. So: MyFunction <- function(AFormula, ADataFrame) { ... } >MyFunction(Y ~ A + B, TheData) would give results something like: Mean of MyData$Y is 5.3 Mean of MyData$A is 3.4 Mean of MyData$B is 8.2 QUESTION 1: How do I determine the terms in the formula within the function? QUESTION 2: How do I use one of those terms to...