[R] Change of parsing parameters to functions between 0.63.1 and 0.63.3 ?

[Athula Herath]

Hi,


I wonder whether the mechanism of parsing parameters to functions has
changed between 0.63.1 and 0.63.3? The following code yeils different
results in R 0.63.1 (Version 0.63.1  (Dec 5, 1998)) and R 0.63.3. 

cave<-function(x,a,b)
{
	return(c(mean(x[a],na.rm=T),mean(x[b],na.rm=T)))
}
datx <- data.frame(rbind(c(1,2,3,4),c(4,5,6,7)))
names(datx)<-c("A","B","C","D")
f1<-c("A","C")
f2<-c("B","D")
t1<-apply(datx,1,cave,f1,f2)




R 0.63.1 Result:


> t1
     1 2
[1,] 2 5
[2,] 3 6


R 0.63.3 Result:

> t1
       1   2
[1,] NaN NaN
[2,] NaN NaN


If I include a 

cat("x[a]->",a,"x[b]->",b,"\n")

in the function (cave)

R 0.63.1 shows the

x[a]-> 1 3 x[b]-> 2 4
x[a]-> 4 6 x[b]-> 5 7

Whereas in R 0.63.3 the result is :

x[a]-> NA NA x[b]-> NA NA 
x[a]-> NA NA x[b]-> NA NA 

Obviously, something is not right. I have verified this in both Unix
(Solaris, Linux) and also on WinNT

However, R Version

Version 0.64.0 Unstable (February 4, 1999)

Reports a similar behaviour to Version 0.63.1 : i.e. giving me the
correct results. 

Many Thanks,


Athula
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