R devel - Nov 2004 - [BUG?] xyplot in loop does not work

Hi,

the following code produces no graphic output:

#####################
library(lattice)
library(car)
data(Robey)

for (i in 1:1) 
  xyplot(tfr~contraceptors, data=Robey)
#####################

However if line with "for" is out-commented then 
one gets graph output.

The following versions were tested:

-------------------------------------
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    1              
minor    9.1            
year     2004           
month    06             
day      21             
language R      

-------------------------------------
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    0.0            
year     2004           
month    10             
day      04             
language R   
-------------------------------------
(Version 2.0.1 were tested too)

best regards
--
Valery.

Valery Khamenya wrote:
> Hi,
> 
> the following code produces no graphic output:
> 
> #####################
> library(lattice)
> library(car)
> data(Robey)
> 
> for (i in 1:1) 
>   xyplot(tfr~contraceptors, data=Robey)
> #####################
Yes, because you need to print()!
See the FAQs.

Uwe Ligges

> However if line with "for" is out-commented then 
> one gets graph output.
> 
> The following versions were tested:
> 
> -------------------------------------
> platform i386-pc-mingw32
> arch     i386           
> os       mingw32        
> system   i386, mingw32  
> status                  
> major    1              
> minor    9.1            
> year     2004           
> month    06             
> day      21             
> language R      
> 
> -------------------------------------
> platform i386-pc-mingw32
> arch     i386           
> os       mingw32        
> system   i386, mingw32  
> status                  
> major    2              
> minor    0.0            
> year     2004           
> month    10             
> day      04             
> language R   
> -------------------------------------
> (Version 2.0.1 were tested too)
> 
> best regards
> --
> Valery.
> 
> ______________________________________________
> R-devel@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel

Please DO as the posting guide asks and read the FAQ before posting.
Do read Q7.22 (and its answer).

On Mon, 22 Nov 2004, Valery Khamenya wrote:
> Hi,
>
> the following code produces no graphic output:
Correct.  It should not.
> #####################
> library(lattice)
> library(car)
> data(Robey)
>
> for (i in 1:1)
>  xyplot(tfr~contraceptors, data=Robey)
> #####################
>
> However if line with "for" is out-commented then
> one gets graph output.
Correct: it should.

-- 
Brian D. Ripley,                  ripley@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

> Please DO as the posting guide asks and read the FAQ before posting.
> Do read Q7.22 (and its answer).
thank you for your answer.
One should NOT be so indignant.

I have read the FAQ *twice* already since I have had to deal with R.
First time about 4 years ago, second about 2 years ago.

Do you mean, Dr.Ripley, one has to carefully read this 
100-pages-FAQ-manual  one time per year or even more often?

I guess this FAQ-entry about fully intuitive behaviour of xyplot came 
last year, right?

BTW, just imagine that the problem is not me. Maybe if the FAQ is too
long then one could reconsider decisions, which have led to this situation.

Anyway I have no fun to follow this flame.

Thank you for your valuable contribution to R.

With *kind* regards,
Valery.