[Rd] `*tmp*`

[luke-tierney at uiowa.edu]

On Thu, 14 Aug 2014, Michael Haupt wrote:

> Hello,
>
> given that `*tmp*` is removed after a replacement, how can code like this work? Is there some special handling for a variable named `*tmp*` when it comes to make element assignments?
>
>> x<-c(1,2)
>> x[1]<-42
>> `*tmp*`[1]<-7 # I would expect this one to fail
>> `*tmp*`
> Error: object '*tmp*' not found

This is a consequence of the tricks the interpreter implementation
currently plays to do complex assignments. Compiled code works
differently:

> library(compiler)
> cmpfun(function() {
+            x<-c(1,2)
+    x[1]<-42
+    `*tmp*`[1]<-7 # I would expect this one to fail
+ })()
Error in cmpfun(function() { : object '*tmp*' not found

luke

>
> Confused greetings,
>
> Michael
>
>

-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
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    Actuarial Science
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