swh:1:snp:887de40c312a4259a22e92c95293ef0f709b045b
Tip revision: 138099729fa36cb6c4eaacac3037ea9105d6700a authored by Hans W. Borchers on 28 November 2013, 00:00:00 UTC
version 1.5.8
version 1.5.8
Tip revision: 1380997
conv.R
##
## c o n v . R Polynomial Convolution
##
conv <- function(x, y) {
if ( (!is.vector(x, mode="numeric") && !is.vector(x, mode="complex")) ||
(!is.vector(y, mode="numeric") && !is.vector(y, mode="complex")) )
stop("Arguments 'x' and 'y' must be real or complex vectors.")
lx <- length(x)
ly <- length(y)
n <- lx + ly - 1
z <- fft(fft(c(x, rep(0, n - lx))) * fft(c(y, rep(0, n - ly))),
inverse = TRUE) / n
if (is.numeric(x) && is.numeric(y))
z <- Re(z)
return(z)
}