<p>If I try to <i>copy()</i> the tables to re-create the pointers all the tables get the <b>same</b> one, always ending in 788 (opening another R session I get the same result, same pointers accross the table, ending in 788):
<pre>
> dt <- readRDS("dt.RDS")
> dt1 <- readRDS("dt1.RDS")
> dput(copy(dt))
structure(list(id = 1:5, var = c(-0.626453810742332, 0.183643324222082,
-0.835628612410047, 1.59528080213779, NA)), .Names = c("id",
"var"), row.names = c(NA, -5L), class = c("data.table", "data.frame"
), .internal.selfref = <pointer: 0x00000000003e0788>)
> dput(copy(dt1))
structure(list(id = 1:10, var2 = c(9.56605515060971, 9.83445938796679,
9.14481066107107, 10.5308762543727, NA, NA, 9.45024506381369,
10.0544601882071, 10.7019565371199, 9.60325830155958), var3 = c(99.6542887323489,
100.659231456233, 100.282028460177, 101.423474800432, 98.4134121985332,
NA, 98.0406472259105, 100.253194731594, 100.759881151841, 99.7930775536395
)), .Names = c("id", "var2", "var3"), row.names = c(NA, -10L), class = c("data.table",
"data.frame"), sorted = "id", .internal.selfref = <pointer: 0x00000000003e0788>)
</pre>
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