Nothing
## This helps to define single-dispatch methods for asNumeric() :
setOldClass("bigz")#, prototype=as.bigz(integer()))
setOldClass("bigq")#, prototype=as.bigq(integer()))
## cannot use as.bigz() yet which is only defined in ./bigz.R
## diff() method for these: this is just base::diff.default()
## ---- with 2 lines commented out: '##>>'
.diff.big <- function(x, lag = 1L, differences = 1L, ...)
{
ismat <- is.matrix(x)
xlen <- if(ismat) dim(x)[1L] else length(x)
if (length(lag) != 1L || length(differences) > 1L ||
lag < 1L || differences < 1L)
stop("'lag' and 'differences' must be integers >= 1")
if (lag * differences >= xlen)
return(x[0L]) # empty, but of proper mode
##>> r <- unclass(x) # don't want class-specific subset methods
i1 <- -seq_len(lag)
if (ismat)
for (i in seq_len(differences))
x <- x[i1, , drop = FALSE] -
x[-nrow(x):-(nrow(x)-lag+1L), , drop = FALSE]
else
for (i in seq_len(differences))
x <- x[i1] - x[-length(x):-(length(x)-lag+1L)]
##>> class(r) <- oldClass(x)
x
}
##--> and entries in ../NAMESPACE
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