R help - May 2007 - Source code of add1

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On 21/05/2007 4:57 AM, Antonio Jos? S?ez 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?
It's in

https://svn.r-project.org/R/trunk/src/library/stats/R/add.R

or substitute "tags/R-x-y-z" for "trunk" if you want to see
what it
looked like in R version x.y.z.

Duncan Murdoch

Antonio Jos? S?ez 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



> 
> ------------------------------------
> Prof. Dr. Antonio Jos? S?ez Castillo
> Dpto. de Estad?stica e Investigaci?n Operativa. Universidad de Ja?n
> Escuela Polit?cnica Superior de Linares. Dep. A-229
> c/ Alfonso X El Sabio 28. 23700 LINARES (Ja?n). ESPA?A.
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> http://www4.ujaen.es/~ajsaez/
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