[R] R memory issues

[eliza botto]

Dear useRs,
I have this funny thing going on with me since morning. I am 32 bit window 7 system with 4 GB RAM(2.95 usable). I tried to run a code on it but when I tried to convert dataframe to matrix by using the following code
mat<-matrix(as.numeric(unlist(SFI)),nrow=nrow(SFI))
*where SFI is my dataframe.
an error came up, "Error: cannot allocate vector of size 237.3 Mb"
I tried to increase memory by using memory.limit(2500) but to no effect. 
Kindly help me out on it as you always do.
Thanks,
Eliza 		 	   		  
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