[R-pkg-devel] Problems with :::

2016-01-28 Thread David Scott 
I am trying to incorporate a print method for flat tables into the 
package xtable which I maintain.


To format the flat table before printing, I wish to use format.ftable 
from the base package stats.
This is unfortunately not exported, so R CMD check --as-cran produces a 
warning because I access that function using stats:::format.ftable.


So, having read the thread about this problem, I think I should copy the 
function into my package. I do that, and declare format.ftable as an S3 
format method. Now I get a different warning:


Registered S3 method from a standard package overwritten by 'xtable':
 methodfrom
 format.ftable stats

I am at a loss. Any suggestions?

David Scott

--
_
David Scott Department of Statistics
The University of Auckland, PB 92019
Auckland 1142,NEW ZEALAND
Phone: +64 9 923 5055, or +64 9 373 7599 ext 85055
Email:  d.sc...@auckland.ac.nz,  Fax: +64 9 373 7018

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Re: [R-pkg-devel] Problems with :::

2016-01-28 Thread Gábor Csárdi 
Ho David, just rename the copied function to sg else. It does not even has
to be s3, probably.

Gabor
On 28 Jan 2016 13:16, "David Scott"  wrote:

> I am trying to incorporate a print method for flat tables into the package
> xtable which I maintain.
>
> To format the flat table before printing, I wish to use format.ftable from
> the base package stats.
> This is unfortunately not exported, so R CMD check --as-cran produces a
> warning because I access that function using stats:::format.ftable.
>
> So, having read the thread about this problem, I think I should copy the
> function into my package. I do that, and declare format.ftable as an S3
> format method. Now I get a different warning:
>
> Registered S3 method from a standard package overwritten by 'xtable':
>  methodfrom
>  format.ftable stats
>
> I am at a loss. Any suggestions?
>
> David Scott
>
> --
> _
> David Scott Department of Statistics
> The University of Auckland, PB 92019
> Auckland 1142,NEW ZEALAND
> Phone: +64 9 923 5055, or +64 9 373 7599 ext 85055
> Email:  d.sc...@auckland.ac.nz,  Fax: +64 9 373 7018
>
> __
> R-package-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>

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Re: [R-pkg-devel] Problems with :::

2016-01-28 Thread Duncan Murdoch 

On 28/01/2016 7:47 AM, David Scott wrote:

I am trying to incorporate a print method for flat tables into the
package xtable which I maintain.

To format the flat table before printing, I wish to use format.ftable
from the base package stats.
This is unfortunately not exported, so R CMD check --as-cran produces a
warning because I access that function using stats:::format.ftable.

So, having read the thread about this problem, I think I should copy the
function into my package. I do that, and declare format.ftable as an S3
format method. Now I get a different warning:

Registered S3 method from a standard package overwritten by 'xtable':
   methodfrom
   format.ftable stats

I am at a loss. Any suggestions?


stats::format() is exported, and it will delegate to format.ftable if 
the class of the object is "ftable".  So the normal solution is just to 
call stats::format() on your object.


If your object has a different class (e.g. "mytable"), it might be that 
you need to do this from your own format.mytable method.  Then 
NextMethod() is supposed to work, assuming the class is really 
c("mytable", "ftable").


If the class is just "mytable", then you'll have to change it to 
"ftable" before calling stats::format().


Duncan Murdoch

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Re: [R-pkg-devel] Problems with :::

2016-01-28 Thread Kirill Müller 

On 28.01.2016 14:20, Duncan Murdoch wrote:
If the class is just "mytable", then you'll have to change it to 
"ftable" before calling stats::format(). 
Side note: The following will fail, because format.ftable double-checks 
the class of its argument:


format_ftable <- utils::getS3method("format", "ftable")
format_ftable(mytable)


-Kirill

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