Ideally they should all work. What is happening is that the current
implementation of complex assignment wants to use a temporary variable
named *tmp*, which it can't when the evaluation environment is locked.
Assignments in compiled code use a different mechanism that I hope
will eventually be ported to the interpreter. Then these should all
work.
Best,
luke
On Wed, 20 Apr 2016, William Dunlap via R-devel wrote:
Shouldn't the following 4 ways to alter an object in a locked environment
either all work or all fail? (All working would be nice, I think.)
E <- new.env()
assign("var", c(1,2,3,4), envir=E)
lockEnvironment(E, bindings=FALSE)
E$var[1] <- 101 ; E$var
#[1] 101 2 3
local(var[2] <- 102, envir=E)
#Error in eval(expr, envir, enclos) :
# cannot add bindings to a locked environment
with(E, var[3] <- 103)
#Error in eval(expr, envir, enclos) :
# cannot add bindings to a locked environment
eval(quote(var[4] <- 104), envir=E)
#Error in eval(expr, envir, enclos) :
# cannot add bindings to a locked environment
get("var", envir=E)
#[1] 101 2 3 4
Bill Dunlap
TIBCO Software
wdunlap tibco.com
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Luke Tierney
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-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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