> I wanted to know the codes of Fourier Transformation of time series
> data.
The location of complete source code for all versions of R is given at
https://cran.r-project.org/sources.html
fft is in the stats package and is implemented as a call to C code, so you'll
need to look in the C source code after unpacking the tar.gz archive; you can
find the called function name by typing 'fft' at the R command line.
For code specific to time series you'll have to identify the R package you're
using and find the source code repository for that. R is open source so the
code for packages should be publicly available.
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