the quote problem with readLines()

Dear all,

I read a file with all numbers with readLines function, as below,

f <- file("data.txt")
a <- readLines(f)

but all the values in a are in format "....", and I cannot do the
calculation with them since they are not numeric. I wonder how should I skip
those quotes, thank you for help! 
I have to use readLines function instead of scan, read.table or matrix,
because the size of file is quite large, and other function cannot allocate
enough space/memory to read the input file.

Best,
Dongyan

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