[R] creating a ps. file

[christopher ciotti]

mike.campana at freesurf.ch wrote:

>Dear all
>
>I wrote a routine. At the end of each cycle of the loop I would like to 
>save the result (plot) in a postcriptfile.
>Of course if I just use dev.print in the following way: 
>dev.print(device=postcript, 'c:/Rfigures/plot_1.ps")
>I overwrite my results with the second cycle of the loop. I suppose 
>there is a way to define the file name so that several plots are 
>created(plot_1,plot_2...).
>
>Could you give me an advice? Thanks a lot
>
>Best Regards 
>Mike
>
>  
>

Hello -

I've never done this in R (I'm a total 'R' newbie) but in C or Java, 
I've used the loop counter as a postfix (or prefix) for the file name.  
You could do it like this (non-R code):

int max = 10;
for(int i = 1; i < max; i++){
    [ . . .] //code for plotting etc  
    writer = PdfWriter.getInstance(document, new 
FileOutputStream(pdfTitle + "_"
                                      + i + ".pdf"));

}

This would give (assuming pdfTitle == "plot"): plot_1.pdf, plot_2.pdf 
and so and so forth

Others may be able to provide pointers etc for writing loops in R.  Hope 
this helps.


-- 
chris ciotti (chris_ciotti at yahoo.com)
PGP ID: 0xE94BB3B7