[R] Puzzling... puzzling... puzzling...

[William Dunlap]

Replace the syntax List$Name with List[["Name"]]
and see if things work better.

'[[' does not do the partial matching that '$' does.
E.g.,
   x <- list(AB=10, BC=20, CD=30)
   x$A # returns 10 because "A" is the initial part of exactly one name in x, "AB"
   x[["A"]] # returns NULL

However, if you have
   y <- list(AB=1, AC=2, AD=3)
then y$A will return NULL because there is not a unique partial
match to "A" among the names of y.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com 

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Michael
> Sent: Monday, February 13, 2012 11:00 AM
> To: r-help
> Subject: [R] Puzzling... puzzling... puzzling...
> 
>  Hi all,
> 
> I made sure that it's "env$sRes1$nPositionsOptimizedM" that's correct...
> 
> not the "env$sRes1$nPositionsOptimized"...
> 
> But it seems both point to the same memory area...
> 
> This is very dangerous because I have used naming conventions such as:
> 
> MyLongVariableNameForA
>  MyLongVariableNameForB
>  MyLongVariableNameForC
> ...
> ...
> 
> Then if internally they are actually the same thing then all my programs
> messed up...
> 
> Any thoughts?
> 
> >env=new.env()
> 
> >load("MyResults.rData", env)
> 
> >identical(env$sRes1$nPositionsOptimized, env$sRes1$nPositionsOptimizedM)
> 
> [1] TRUE
> 
> 	[[alternative HTML version deleted]]
> 
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