[R] issues with identical()

[Liaw, Andy]

> d1 <- data.frame(x=1:3, y=4:6)
> d2 <- data.frame(x=1:3, z=4:6)
> d3 <- data.frame(x=1:3, y=4:6)
> identical(d1, d2)
[1] FALSE
> identical(d1, d3)
[1] TRUE

Andy

> From: Jean Eid
> 
> Hi all, hope you having a nice day,
> 
> I ahve this weird results with identical (probably I am not 
> understanding
> correctly what it does ...)
> 
> I have these two data frames and I issue :
> > identical(temp, temp1)
> [1] FALSE
> 
> 
> However, these data frames are Nx2 and when I issue:
> > identical(temp[,2], temp1[,2])
> [1] TRUE
> > identical(temp[,1], temp1[,1])
> [1] TRUE
> 
> and the results from str
> 
> 
> > str(temp)
> `data.frame':	7072 obs. of  2 variables:
>  $ pub_id  : int  10000 1000 10001 10002 10003 10004 10005 10006 10007
>  $ faminc90: int  -2 5998 19900 43000 35000 40000 56538 61000 
> 36000 39105
> > str(temp1)
> `data.frame':	7072 obs. of  2 variables:
>  $ pub_id: int  10000 1000 10001 10002 10003 10004 10005 
> 10006 10007 10008
>  $ faminc: int  -2 5998 19900 43000 35000 40000 56538 61000 
> 36000 39105
> 
> The question is why are the objects different. How else can I 
> tell what is
> the difference
> 
> 
> Thank You
> 
> Jean
> 
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