https://github.com/cran/pracma
Tip revision: bf076735a09836a6103775a9d4efaf8f0ecad928 authored by Hans W. Borchers on 02 December 2018, 07:00:03 UTC
version 2.2.2
version 2.2.2
Tip revision: bf07673
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)
}