within.mitml.list <- function(data, expr, ignore = NULL, ...){
# evaluate an expression for a list of data sets, then return altered data sets
expr <- substitute(expr)
parent <- parent.frame()
out <- lapply(data, function(x){
e <- evalq(environment(), x, parent)
eval(expr, e)
l <- as.list(e)
l <- l[!sapply(l, is.null)]
l[ignore] <- NULL
nD <- length(del <- setdiff(names(x), (nl <- names(l))))
x[nl] <- l
if(nD){
x[del] <- if(nD == 1){ NULL } else { vector("list", nD) }
}
x
})
class(out) <- c("mitml.list", "list")
return(out)
}
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