R help - Sep 2021 - Codes of Fourier Transformation

Dear Sir/Madam
                  I wanted to know the codes of Fourier Transformation of
time series data.

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> 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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