[Rd] R 1.3.0 bug: after "y _ 10; x[[1]] _ y", assigning to "y[1]" modifies "x" (PR#1043)
buhr@stat.wisc.edu
buhr@stat.wisc.edu
Tue, 7 Aug 2001 22:38:04 +0200 (MET DST)
After a list element has been assigned from a vector variable,
assigments to elements of the original vector variable modify the copy
stored in the list as well.
Here's a transcript illustrating the problem:
R : Copyright 2001, The R Development Core Team
Version 1.3.0 (2001-06-22)
[ . . . ]
> x _ list()
> y _ 10
> x[[1]] _ y
> x
[[1]]
[1] 10
> y[1] _ 20 # should only modify "y"
> x
[[1]]
[1] 20 # ACK! we modified "x", too
>
Kevin <buhr@stat.wisc.edu>
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