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read.table freezes the computer

Jie
Hi All,

I have a txt file to read into R. The size of it is about 500MB.
This txt file is produced by calling  write.table(M, file =
"xxx.txt"), where M is a large matrix
After running MM = read.table("xxx.txt"), the R gui keeps a cpu
core/thread fully occupied forever.
64 bit R with 16GB RAM on Win7 64, i5 cpu should be capable. So if
anyone knows the reason, that will be appreciated.
Thank you for any advice.

Best wishes,
Jie