[R] memory allocation problem

[Elham -]

hi everyone,
I tried to run my code in RStudio,but I received this error message,what should I do?
Error: cannot allocate vector of size 12.1 Gb
In addition: Warning messages:
1: In cor(coding.rpkm[grep("23.C", coding.rpkm$name), -1], ncoding.rpkm[grep("23.C",  :
  Reached total allocation of 6027Mb: see help(memory.size)
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