look at the underlying source code

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Hello,

There are two simple ways,

1. Type  the function name without parenthesis at an R prompt;
2. Download the source from CRAN or R-Forge, R is open source.

Hope this helps,

Rui Barradas

jaimie villanueva wrote
hi

someone can show me how can i get the source code of a function. Is a S4
class or Method. (I'm not an expert in R environment)
Exactly, Function "ugarchsim" from library (rugarch).
I need to know (in detailed ) how the variance and  mean ecuation of a
arma/garch process are calculated.
With other packages like "fGarch" i used to invoked the function debug ()
and allows me to step into the functions but with ugarchsim i can't use
it.

any suggestions are well received

thanks

Jamie

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Unfortunately the task is slightly harder here -- ugarchsim calls a
network of S4 code that is a little hard to trace....

You can get started by typing

getMethod("ugarchsim", "uGARCHfit")

to see the first step which calls a variety of functions with names like

.sgarchsim

You'll have to read a line of code here that uses switch so it's a
little harder to follow if you've never used that construct before
than method dispatch or if/then might be.

It looks like these are not exported so you'll have to use

getAnywhere(.sgarchsim)

to start following those. It looks like that in turn calls .sgarchsim1
or .sgarchsim2 which are the end of the line and should help you out.

Hope this helps,
Michael
Hello,

There are two simple ways,

1. Type ?the function name without parenthesis at an R prompt;
2. Download the source from CRAN or R-Forge, R is open source.

Hope this helps,

Rui Barradas

jaimie villanueva wrote
hi

someone can show me how can i get the source code of a function. Is a S4
class or Method. (I'm not an expert in R environment)
Exactly, Function "ugarchsim" from library (rugarch).
I need to know (in detailed ) how the variance and ?mean ecuation of a
arma/garch process are calculated.
With other packages like "fGarch" i used to invoked the function debug ()
and allows me to step into the functions but with ugarchsim i can't use
it.

any suggestions are well received

thanks

Jamie

? ? ? [[alternative HTML version deleted]]

______________________________________________
R-help@ mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

--
View this message in context: http://r.789695.n4.nabble.com/look-at-the-underlying-source-code-tp4630532p4630538.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
hi

someone can show me how can i get the source code of a function. Is a S4
class or Method. (I'm not an expert in R environment)
Exactly, Function "ugarchsim" from library (rugarch).
I need to know (in detailed ) how the variance and  mean ecuation of a
arma/garch process are calculated.
With other packages like "fGarch" i used to invoked the function debug ()
and allows me to step into the functions but with ugarchsim i can't use it.

any suggestions are well received

See Uwe Ligges's article in R News,

Accessing the sources. Uwe Ligges, R News, 6(4):43-45, October 2006

There's a link to it in the "Technical Papers" section of the HTML help 
pages.

Duncan Murdoch