[R] looping multipanel plots to different figures

[efisio solazzo]

Dear,
cannot find  a way to direct multipanel plots to different figures 
(files) while within a loop.

Say, the loop creates two plots each step: one plot should go to figure 
1 and the other to  figure 2.
Same for the next steps of the loop: the plots should go to figure 1 
and  figure 2 in a multipanel fashion.

I am not sure at which point to open the files and set the multipanel 
parameters...all I can get is two files with all plots overlaid to the 
same position.

Thanks