[Rd] Bugs due to naive copying of list elements

luke-tierney at uiowa.edu luke-tierney at uiowa.edu
Tue Mar 12 21:41:43 CET 2013

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



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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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
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu

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