Nothing
gdif <- function (a3)
{
#### this is a modified copy of the function "dif" from the shapes package ####
#### Copyright by Ian Dryden
cc <- cSize(addo(a3)/dim(a3)[3])
x <- sweep(a3, c(1, 2), arrMean3(a3))
z <- sqrt(sum((as.vector(x)/cc)^2/dim(a3)[3])^2)
return(z)
}
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