R help - Feb 2005 - Ask for help on the parallel function output to a pdf file

Dear all,

 

Could you please give me a hand on parallel function from package
lattice?

 

On the R command console, the following commands can output a parallel
coordinate plot to the pdf file.

library(lattice); pdf("trial.pdf"); data(iris); parallel(~iris[1:4] |
Species, iris); dev.off();

However, if these commands are encapsulated into a function, the
resultant pdf file is empty. For example, we define a simple function
paraExam below, paraExam() may generate a pdf file which is empty from a
pdf viewer. 

paraExam<-function(file="trial.pdf"){

 library(lattice);

 pdf(file);

 data(iris);

 parallel(~iris[1:4] | Species, iris);

 dev.off();

 }

 

Please give me some tips to output parallel coordinate plots to a pdf
file within a function successfully?

Regards,

Warren

 


	[[alternative HTML version deleted]]

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f


On Sunday 20 February 2005 15:35, Warren.Jin at csiro.au
wrote:
> Dear all,
>
>
>
> Could you please give me a hand on parallel function from package
> lattice?
>
>
>
> On the R command console, the following commands can output a
> parallel coordinate plot to the pdf file.
>
> library(lattice); pdf("trial.pdf"); data(iris);
parallel(~iris[1:4] |
> Species, iris); dev.off();
>
> However, if these commands are encapsulated into a function, the
> resultant pdf file is empty. For example, we define a simple function
> paraExam below, paraExam() may generate a pdf file which is empty
> from a pdf viewer.
>
> paraExam<-function(file="trial.pdf"){
>
>  library(lattice);
>
>  pdf(file);
>
>  data(iris);
>
>  parallel(~iris[1:4] | Species, iris);
>
>  dev.off();
>
>  }
>
>
>
> Please give me some tips to output parallel coordinate plots to a pdf
> file within a function successfully?

On 21 February 2005 at 08:35, Warren.Jin at csiro.au wrote:
| However, if these commands are encapsulated into a function, the
| resultant pdf file is empty. For example, we define a simple function
| paraExam below, paraExam() may generate a pdf file which is empty from a
| pdf viewer. 
| 
| paraExam<-function(file="trial.pdf"){
|  library(lattice);
|  pdf(file);
|  data(iris);
|  parallel(~iris[1:4] | Species, iris);
|  dev.off();
|  }

It's the (current) mother of all FAQs: You need a print() about your lattice
plot command, i.e.

   print(parallel(~iris[1:4] | Species, iris))

Dirk

PS You can drop the ';'.


-- 
Better to have an approximate answer to the right question than a precise 
answer to the wrong question.  --  John Tukey as quoted by John Chambers