R help - Aug 2012 - cannot allocate a vector of size error, what explodes the the memory consumption?

Dear R users,

I keep getting the message "Error: cannot allocate a vector of size 543.2
Mb" on my 64 bit Linux machine with 4 Gb of memory. I studied the problem
and it occurs at the last lines of my code:

..........
a <- laply(.........);
save(a, file= "file.RData");
rm(a);

"a" is a 4-d array of size about 600 Mb. 3 minutes before R exits and
displays the error message, the
memory consumption of R (diagnosed with top) is 1.8 Gb. 2 minutes before the
error, the memory consumption of R suddenly expands to 2.8 Gb and one minute
before the error it is 3 Gb. This is why I suspect the problem
is with my code. I have checked the same code with smaller data sets, it works
perfectly. But with larger data sets, that is when the size of "a"
gets bigger than, say, about 500 Mb, I get the error.
Actually 99% of the time the memory consumption is up to 1.8 Gb. This is while
things are going within laply.
And at the end, at these 3 last lines something causes more than doubling of the
R memory consumption.
Have you got any idea what the culprit is?

Any suggestions will be appreciated.

Best regards,
Martin

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