Nothing
`combine` <-
function (pimgs, subset = 1:length(pimgs))
{
bad <- unlist(lapply(pimgs, function(x) is.null(x$image)))[subset]
subset <- subset[!bad]
res <- as.image.pimg(pimgs[[subset[1]]])
if (length(subset) == 1)
return(res)
for (i in subset[-1]) {
img <- pimgs[[i]]
Xpos <- img$offset[1]
Ypos <- img$offset[2]
Xind <- Xpos:(Xpos + dim(img$image)[1] - 1)
Yind <- Ypos:(Ypos + dim(img$image)[2] - 1)
res$z[Xind, Yind] <- res$z[Xind, Yind] + img$image
}
res
}
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