data.frame and import to xlsx

Hi,
i have a very huge number of data with the size 2375ko, i want to import
them for R to xlsx
but the size of excel is limited
How can i resolve this problem?
And please how can i define the frame 
Note that i have a table 
rows times c(1.....100) columns WLc(200...1000) and inside S c(15,.........)
the table it is full values  



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