[Rd] Bugs due to naive copying of list elements
Radford Neal
radford at cs.toronto.edu
Tue Mar 12 11:59:07 CET 2013
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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