R help - Dec 2004 - read attribute

How can I get a single attribute value of an object ?

I jhave the tiemSeries object
> ts1
                    Open
2003-10-09 02:00:00 1.27
2003-10-10 02:00:00 1.25
2003-10-13 02:00:00 1.27
2003-10-14 02:00:00 1.29

When I unclass ts1 I get:
> unclass(ts1)
list()
attr(,"Data")
                    Open
2003-10-09 02:00:00 1.27
2003-10-10 02:00:00 1.25
2003-10-13 02:00:00 1.27
2003-10-14 02:00:00 1.29
attr(,"positions")
[1] "2003-10-09 02:00:00" "2003-10-10 02:00:00"
"2003-10-13 02:00:00"
[4] "2003-10-14 02:00:00"
attr(,"format")
[1] "%Y-%m-%d %H:%M:%S"
attr(,"FinCenter")
[1] "Zurich"
attr(,"units")
[1] "Open"
attr(,"title")
[1] "Time Series Object"
attr(,"documentation")
[1] "Created at Zurich 2004-12-13 15:13:05"

How can I get teh value of the attribute positions?

Omar Lakkis <abu3ammar at gmail.com> writes:
> > unclass(ts1)
> list()
....
> attr(,"positions")
> [1] "2003-10-09 02:00:00" "2003-10-10 02:00:00"
"2003-10-13 02:00:00"
> [4] "2003-10-14 02:00:00"
..........
> 
> How can I get teh value of the attribute positions?
The output is providing a rather strong hint: attr(ts1, "positions")

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

Since I'm not sure what you are trying to achieve would ts1 at positions get
what you wanted without unclassing the object. I only ask this because my first
instinct when I started using the Rmetrics package was to try and use
ts1$positions which only gives you a null value.

Tom
> -----Original Message-----
> From: Omar Lakkis [mailto:abu3ammar at gmail.com]
> Sent: Tuesday, 14 December 2004 4:10 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] read attribute
> 
> 
> How can I get a single attribute value of an object ?
> 
> I jhave the tiemSeries object
> > ts1
>                     Open
> 2003-10-09 02:00:00 1.27
> 2003-10-10 02:00:00 1.25
> 2003-10-13 02:00:00 1.27
> 2003-10-14 02:00:00 1.29
> 
> When I unclass ts1 I get:
> > unclass(ts1)
> list()
> attr(,"Data")
>                     Open
> 2003-10-09 02:00:00 1.27
> 2003-10-10 02:00:00 1.25
> 2003-10-13 02:00:00 1.27
> 2003-10-14 02:00:00 1.29
> attr(,"positions")
> [1] "2003-10-09 02:00:00" "2003-10-10 02:00:00"
"2003-10-13 02:00:00"
> [4] "2003-10-14 02:00:00"
> attr(,"format")
> [1] "%Y-%m-%d %H:%M:%S"
> attr(,"FinCenter")
> [1] "Zurich"
> attr(,"units")
> [1] "Open"
> attr(,"title")
> [1] "Time Series Object"
> attr(,"documentation")
> [1] "Created at Zurich 2004-12-13 15:13:05"
> 
> How can I get teh value of the attribute positions?
> 
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