There’s no way to reproduce this. And there’s no version info (sessionInfo()).
There’s little we can do with it.
I suggest you’ve a look at
https://github.com/Rdatatable/data.table/wiki/Support and provide us with the
necessary data/code for us to reproduce.
--
Arun
On 3 Sep 2015 at 19:58:41, George Gui ([email protected]) wrote:
Hi,
I had a memory bug when I tried to run the following script that wants to
select a subset rows of data.table, the bug is somehow fixed by making a copy
of the input data.table however:
library(data.table)
load('test_bug.RData')
Test.Bug <- function(tmp_move, ID){
print(ID)
#tmp_move <- copy(tmp_move)
coverage <- tmp_move[, .(c.count= sum(dummy== 0)), by= group]
groups_selected <- unique(coverage[c.count>120, group])
tmp_move2 <- tmp_move[group %in% groups_selected]
return(tmp_move2)
}
move[, Test.Bug(.SD, ID), by= ID]
*** caught segfault ***
address 0x7fc3910d2824, cause 'memory not mapped'
Traceback:
1: bmerge(i, x, leftcols, rightcols, io <- FALSE, xo, roll = 0, rollends =
c(FALSE, FALSE), nomatch = 0L, verbose = verbose)
2: `[.data.table`(tmp_move, group %in% groups_selected)
3: tmp_move[group %in% groups_selected]
4: Test.Bug(.SD, ID)
5: `[.data.table`(move, , Test.Bug(.SD, ID), by = ID)
6: move[, Test.Bug(.SD, ID), by = ID]
--
Zhida(George) Gui
Mathematics and Economics Major
Email:[email protected]
Cell:773-614-2597
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