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Dear All, How to do Hodrick-Prescott Filter in R? Thanks! [[alternative HTML version deleted]]

Dear all, What is the usage of the ".Call()"? What is the meaning of the follows: S=.Call("RS_fractal_spectral_density_function_direct",x,as.vector(taper.),as.logical(center),as.logical(recenter),TRUE,as.integer(npad),COPY=rep(FALSE,6),CLASSES=c(rep("matrix",2),rep("logical",3),"integer"),PACKAGE="ifultools") And is a function

Dear all, I am searching the period of a time series usering R. Is there some lag window functions in R? Could you give me some books about spectral analysis usering R? best wishes, Wang [[alternative HTML version deleted]]

Dear All, How to use SQL code in R? Thanks! [[alternative HTML version deleted]]

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Dear all£¬ Could you tell me how to compute Autocorrelation function use fft? Thanks! [[alternative HTML version deleted]]

Dear all, How to do ADF test ¡¢KPSS¡¢ PP¡¢GLS test in R£¿ Thanks a lot ! [[alternative HTML version deleted]]