memory.size question

How to deal with this question?

Aimin


 > plot(p1982)
Error: cannot allocate vector of size 3640 Kb
In addition: Warning messages:
1: Reached total allocation of 494Mb: see help(memory.size)
2: Reached total allocation of 494Mb: see help(memory.size)
3: Reached total allocation of 494Mb: see help(memory.size)
4: Reached total allocation of 494Mb: see help(memory.size)
5: Reached total allocation of 494Mb: see help(memory.size)
6: Reached total allocation of 494Mb: see help(memory.size)