[R] Simple for-loop runs out of memory

[Astrix]

I have the following simple for-loop, which makes R crash every time. The
length of the vectors is about 1200 rows, 1 column.

n = max(length(GSPC),length(FTSE))

for(i in 1:1000)
{
	if (row.names(GSPC)[i]==row.names(FTSE)[i]){
	} else {
		if (row.names(GSPC)[i]>row.names(FTSE)[i]){	
		GSPC<-rbind(GSPC[1:(i-1),],GSPC[(i-1):length(GSPC),])
		row.names(GSPC)[i]=row.names(FTSE)[i]
		} else {
		FTSE<-rbind(FTSE[1:(i-1),],FTSE[(i-1):length(FTSE),])
		row.names(FTSE)[i]=row.names(GSPC)[i]
		}
	}

}

I have no idea why it crashes, it should be a very simple task of running
through the 1200 entries. The if loop is called only about 10 times during
the entire loop.
What could be the problem?
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