Re: inverting a timeDate sequence

[Tony Plate <tplate@blackmesacapital.com>]

somewhat simpler is

> rev(td)

(no need to mess around with the internals when the class fully supports 
the indexing operations needed)
At Tuesday 02:42 PM 9/16/2003 -0500, Jeffrey Wang wrote:
>     timeDate objects are stored internally as a list of integers. You can 
> reverse them by:
> > td@.Data[[1]] = rev(td@.Data[[1]])
> > td@.Data[[2]] = rev(td@.Data[[2]])
>
> ----
> Jeffrey Wang
> Ronin Capital LLC
> Chicago, IL 60604
> Tel: (312) 244-5768
> Fax: (312) 244-5836
> -----Original Message-----
> From: Paul H. Lasky [mailto:phlasky@earthlink.net]
> Sent: Tuesday, September 16, 2003 2:36 PM
> To: SPlus-News
> Subject: [S] inverting a timeDate sequence
>
>
>     How do you create a timeDate sequence with the latest date as the 
> first element and oldest date the last element, AND exclude weekends 
> (utilizing Splus 6.1)?  The following efforts were unsuccessful:
>    td = timeSeq(from="9/15/2003", to = "4/15/2003", by=-"bizdays")
>
>    td = timeSeq(from="9/15/2003", to="4/15/2003", by = "bizdays")
>
> or
>  td1 = timeSeq(from="4/15/2003", to"9/15/2003", by="bizdays")
> td = -sort(-td1)  [ sort does not work with timeDate sequences]
>
> Is it really necessary to inelegantly process td1 in a for loop   --- 
> which does work ? e.g.
>   td = td1
>   for( i in 1:length(td1) )  td[ length(td1) -i +1 ] = td1[ i ] }
>
> Incidentally this is a very slow processing.
>
> Paul H. Lasky
> B & P Consultants
> Rancho Santa Fe, CA
>
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Tony Plate   tplate@acm.org