[Rd] Bugs due to naive copying of list elements

[luke-tierney at uiowa.edu]

Thanks for the report. Fixed in r62220 on trunk, r62221 on
R-3-0-branch, and r62222 on R-2-15-branch.

Best,

luke

On Tue, 12 Mar 2013, Radford Neal wrote:

> Several bugs are present in R-2.15.3 and R-alpha due to
> naive copying of list elements.
>
> The bug below is due to naive copying in subset.c (with
> similar bugs for matrices and arrays):
>
> a<-list(c(1,2),c(3,4),c(5,6))
> b<-a[2:3]
> a[[2]][2]<-9
> print(b[[1]][2])
>
> Naive copying in mapply.c leads to the following bug:
>
> X<-1+1
> f<-function(a,b) X
> A<-mapply(f,c(1,2,3),c(4,5,6),SIMPLIFY=FALSE)
> print(A)
> X[1]<-99
> print(A)
>
> Similar bugs exist in eapply, rapply, and vapply.
>
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> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:   luke-tierney at uiowa.edu
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