issues with identical()
On Fri, 20 May 2005, Jean Eid wrote:
Hi all, hope you having a nice day, I ahve this weird results with identical (probably I am not understanding correctly what it does ...)
Why should
a data frame with colunns pub_id faminc90
a data frame with colunns pub_id faminc
be considered identical()? Its description is
The safe and reliable way to test two objects for being _exactly_
equal.
and those are not equal in a critical way.
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
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595