[R] names function not working at the 2nd place in a program

[arun]

HI,

I am not getting errors with this:
 myvar1<- array(1:3, c(2,4)) 
 myvar2<- array(4:6, c(2,4)) 
 names(myvar1)
#NULL
names(myvar1)<-as.numeric(1:8)
names(myvar1)
[1] "1" "2" "3" "4" "5" "6" "7" "8"
 names(myvar2)<-names(myvar1)
names(myvar2)
[1] "1" "2" "3" "4" "5" "6" "7" "8"

#But, if you look at str()

 str(myvar2)
 int [1:2, 1:4] 4 5 6 4 5 6 4 5
 - attr(*, "names")= chr [1:8] "1" "2" "3" "4" ...
 is.numeric(names(myvar2))
[1] FALSE


A.K.




----- Original Message -----
From: zz <czhang at uams.edu>
To: r-help at r-project.org
Cc: 
Sent: Thursday, July 26, 2012 5:19 PM
Subject: [R] names function not working at the 2nd place in a program

Hello,

I am using names function to name an array. 
It works first time when I use *as.numeric(names(myVar1)*
However, at a place later, when I tried to use a very similar line of code
*as.numeric(names(myVar2)*, it always returned 'numeric(0)' (or if I only
type 'names(myVar2), it gave me NULL'.

Both myVar1 and myVar2 are type of integer.  The only difference that I can
tell is where the names function are called in my code.

Does anyone have an idea what may cause the problem?

Thanks in advance. 



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