Attributes of a dataframe

[Treacy, Glenn]

I am using attributes to tag a dataset with meta information. I find that if restrict the columns of my dataset by a command such as

jj.df<-jj.df[,-c(2,6,8)] or jj.df<-jj.df[,c(8,7,9,10)]

that the attributes I set originally are dropped. Can anyone explain why that is and whether I can stop it happening?

Regards and thank you in advance,
Glenn

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[Patrick Burns]

It is a general feature that (most) attributes get
dropped during subscripting.  I think you need
to make your own class of object and write a
subscripting method for the class.


Patrick Burns
patrick@...
[phone]
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")

Treacy, Glenn wrote:

>
> I am using attributes to tag a dataset with meta information. I find
> that if restrict the columns of my dataset by a command such as
>
> jj.df<-jj.df[,-c(2,6,8)] or jj.df<-jj.df[,c(8,7,9,10)]
>
> that the attributes I set originally are dropped. Can anyone explain
> why that is and whether I can stop it happening?
>
> Regards and thank you in advance,
> Glenn
>
> **********************************************************************************
>
> *Irish Life Investment Managers Limited is authorised by the Financial
> Regulator. Irish Life Investment Managers Limited Registered Office:
> Beresford Court, Beresford Place, Dublin 1. Registered in Ireland
> Number 116000*
>
>  
>
> While Irish Life Investment Managers uses reasonable efforts to ensure
> that the information contained in this email is current, accurate and
> complete at the date of publication, no representations or warranties
> are made (express or implied) as to the reliability, accuracy or
> completeness of such information. Irish Life Investment Managers
> therefore cannot be held liable for any loss arising directly or
> indirectly from the use of, or any action taken in reliance on, any
> information contained in this email.
>
>  
>
> This material is for information only and does not constitute an offer
> or recommendation to buy or sell any investment, or subscribe to any
> investment management or advisory service. It is intended for the use
> of institutional and other professional investors. Past performance is
> not indicative of future results. The value of funds we manage may
> fall as well as rise.
>
>  
>
> This email and any files transmitted with it are confidential and
> intended solely for the use of the individual or entity to whom they
> are addressed. If you have received this email in error please notify
> the system manager. This footnote also confirms that this email
> message has been swept for the presence of computer viruses.
>
> **********************************************************************************
>
>  
>

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