[R] Source code of add1

[Uwe Ligges]

Antonio José Sáez Castillo wrote:
> We are developing a new regression model. We now need to develop an analogous to add1 in stat package.
> My problem is about update.formula, but I think I could solve this problem if I can get source code of add1.
> So, can I get the source code of add1?

Sure. What is the problem?

You can easily look into them after download (or a bit less convenient 
even directly in R):

add1          # ah, it's generic!
methods(add1) # its methods
## Let's look into two methods:
stats:::add1.default
stats:::add1.lm

You might also want to look into the following R News article:

Ligges, U. (2006): R Help Desk: Accessing the Sources. R News 6 (4), 43-45.


Uwe Ligges




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> Prof. Dr. Antonio José Sáez Castillo
> Dpto. de Estadística e Investigación Operativa. Universidad de Jaén
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