R help - Nov 2012 - how to view source code of a function inside a package?

Dear list,
I am trying to look at the function inside a package.  I know that
methods() would do the trick, but what if the function is hidden?  I have a
problem displaying the hidden function.

Say, for example the MCMC package.  How do you view the code of that
function?

something like this:
> which
function (x, arr.ind = FALSE, useNames = TRUE)

{

    wh <- .Internal(which(x))

    if (arr.ind && !is.null(d <- dim(x)))

        arrayInd(wh, d, dimnames(x), useNames = useNames)

    else wh

}

<bytecode: 0x1021eef50>

<environment: namespace:base>

	[[alternative HTML version deleted]]

On 15/11/2012 2:21 PM, C W wrote:
> Dear list,
> I am trying to look at the function inside a package.  I know that
> methods() would do the trick, but what if the function is hidden?  I have a
> problem displaying the hidden function.
>
> Say, for example the MCMC package.  How do you view the code of that
> function?
You can use the prefix MCMC:::foo to display the foo function from MCMC, 
whether or not it is exported.

Duncan Murdoch
>
> something like this:
>
> > which
>
> function (x, arr.ind = FALSE, useNames = TRUE)
>
> {
>
>      wh <- .Internal(which(x))
>
>      if (arr.ind && !is.null(d <- dim(x)))
>
>          arrayInd(wh, d, dimnames(x), useNames = useNames)
>
>      else wh
>
> }
>
> <bytecode: 0x1021eef50>
>
> <environment: namespace:base>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.

This is R FAQ 7.40, and that document gives some good pointers:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-do-I-access-the-source-code-for-a-function_003f

I prefer to simply download the source code version of the package
from CRAN, so that comments aren't stripped, but there are several
other options.

Sarah

On Thu, Nov 15, 2012 at 2:21 PM, C W <tmrsg11 at gmail.com>
wrote:
> Dear list,
> I am trying to look at the function inside a package.  I know that
> methods() would do the trick, but what if the function is hidden?  I have a
> problem displaying the hidden function.
>
> Say, for example the MCMC package.  How do you view the code of that
> function?
>
> something like this:
>
>> which
>
> function (x, arr.ind = FALSE, useNames = TRUE)
>
> {
>
>     wh <- .Internal(which(x))
>
>     if (arr.ind && !is.null(d <- dim(x)))
>
>         arrayInd(wh, d, dimnames(x), useNames = useNames)
>
>     else wh
>
> }
>
> <bytecode: 0x1021eef50>
>
> <environment: namespace:base>

--
Sarah Goslee
http://www.functionaldiversity.org

It might be a C code wrapped around.
-m

On Thu, Nov 15, 2012 at 8:21 PM, C W <tmrsg11 at gmail.com>
wrote:
> Dear list,
> I am trying to look at the function inside a package.  I know that
> methods() would do the trick, but what if the function is hidden?  I have a
> problem displaying the hidden function.
>
> Say, for example the MCMC package.  How do you view the code of that
> function?
>
> something like this:
>
>> which
>
> function (x, arr.ind = FALSE, useNames = TRUE)
>
> {
>
>     wh <- .Internal(which(x))
>
>     if (arr.ind && !is.null(d <- dim(x)))
>
>         arrayInd(wh, d, dimnames(x), useNames = useNames)
>
>     else wh
>
> }
>
> <bytecode: 0x1021eef50>
>
> <environment: namespace:base>
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.


-- 
Mehmet S?zen, Ph.D. ( Dr.phil.nat. )
<suzen at acm.org>

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