Force evaluation of a symbol when a function is created

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
Of Schoenfeld, David Alan,Ph.D.,Biostatistics
Sent: Monday, August 06, 2012 2:08 PM
To: 'r-help at r-project.org'
Subject: [R] Force evaluation of a symbol when a function is created


I am porting a program in matlab to R,
The problem is that Matlab has a feature where symbols that aren't arguments are
evaluated immediately.
That is:
Y=3
F=@(x) x*Y

Will yield a function such that F(2)=6.
If later say. Y=4 then F(2) will still equal 6.

R on the other hand has lazy evaluation.
F<-function(x){x*Y}
Will do the following
Y=3
F(2)=6
Y=4
F(2)=8.
Does anyone know of away to defeat lazy evaluation in R so that I can easily simulate the
Matlab behavior.  I know that I can live without this in ordinary programming but it would
make my port much easier.

Thanks.




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