Hi,
Try this:
F<-function(x,type="local"){Y=3
x*Y}
F(3)
#[1] 9
Y<-4
F(3)
#[1] 9
Y<-5
F(3)
#[1] 9
A.K.
----- Original Message -----
From: "Schoenfeld, David Alan,Ph.D.,Biostatistics" <dschoenf...@partners.org>
To: "'r-help@r-project.org'" <r-help@r-project.org>
Cc:
Sent: Monday, August 6, 2012 5:07 PM
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.
The information in this e-mail is intended only for the ...{{dropped:14}}
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
