[R] Rcmdr -> doItAndPrint -> summary method of S4-class object not in Rcmdr window but R Console

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon Nov 22 11:56:48 CET 2004

The FAQ Q8.1 does recommend that summary() methods do not print themselves 
but returned a classed object to be printed.

What doItAndPrint does is to capture the result of an explicit print, so 
it will only work for summary methods that follow that recommendation.

I do think doItAndPrint should be capturing all the output from a function 
via sink(), and not just the print of the final result.

On Mon, 22 Nov 2004, Pfaff, Bernhard wrote:

> Dear list member,
> John Fox proposed to me posting this problem to R-Help:
> I have written a function suited for Rcmdr and included this in a R-file
> located in Rcmdr/etc as well as an augmented `Rcmdr-menus.txt'.
> Now, I am faced with the following problem:
> method show() of a S4-class object works flawlessly, that is `doItAndPrint'
> works flawlessly and its output is returned correctly into the Rcmdr-Window.
> However, by using method summary() for the same S4-class object fails, in
> the sense that the output is *not* printed in the Rcmdr window, but into the
> R Console. The summary()-method contains cat() and slots of the S4-class
> objects only.
> My question is: How can it be achieved that method summary() of S4 objects
> is printed in the RCmdr window and why, in the first instance, does it fail
> to do so by using `doItAndPrint'.
> Any help or pointer is much appreciated,
> Best Regards
> Bernhard
> platform i386-pc-mingw32
> arch     i386
> os       mingw32
> system   i386, mingw32
> status
> major    2
> minor    0.1
> year     2004
> month    11
> day      15
> language R
> --------------------------------------------------------------------------------
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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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