Thank you for replying. when I've tried to run the R syntax in a 64 bit computer,the problem is solved. Thank you for helping out. I totally agree your advice. I would like to answer all your questions in case other people meet the same problem. The data contains one timestamp column with time zone, one integer column, and 12 Boolean columns. I tried to run one month sample, before >memory.limit() [1] 3583 > memory.size(max=F) [1] 156.82 > memory.size(max=T) [1] 241.06 After > memory.limit() [1] 3583 > memory.size(max=F) [1] 199.97 > memory.size(max=T) [1] 241.56
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