[R] memory problem for scatterplot using ggplot

[Edwin Husni Sutanudjaja]

Dear all,

I have a memory problem in making a scatter plot of my 17.5 million-pair 
datasets.
My intention to use the "ggplot" package and use the "bin2d". Please find the 
attached script for more details.

Could somebody please give me any clues or tips to solve my problem?? please ...
Just for additional information: I'm running my R script on my 32-bit machine: 
Ubuntu 9.10, hardware: AMD Athlon Dual Core Processor 5200B, memory: 1.7GB.

Many thanks in advance.
Kind Regards, 

-- 
Ir. Edwin H. Sutanudjaja
Dept. of Physical Geography, Faculty of Geosciences, Utrecht University