Re: [R] Howto crosstable-ing......

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Thu 23 Jun 2005 - 01:31:40 EST


Looks to me like you want something like reshape()...

Andy

> From: v.demartino2@virgilio.it
>
> I receive the following meteo dataset regularly, containing
> the average
> daily temperatures (tMedia) of a certain month for 24
> selected meteo-stations
> (COD_WMO) whose human-readable names are in (NOME).
>
> str(tabella)
> `data.frame': 1038 obs. of 4 variables:
> $ COD_WMO: int 16045 16045 16045 16045 16045 16045 16045
> 16045 16045 16045
> ...
> $ NOME : Factor w/ 24 levels "ALGHERO","BARI/PALESE
> MACCHIE",..: 22 22
> 22 22 22 22 22 22 22 22 ...
> $ DATE :'POSIXct', format: chr "2005-05-01" "2005-05-02"
> "2005-05-03"
> "2005-05-04" ...
> $ tMedia : num 11.7 18.6 16.9 19.7 15.0 ...
>
>
> Here you are a short list of it:
> COD_WMO NOME DATE tMedia
> 505 16191 FALCONARA 2005-06-01 20.95
> 506 16191 FALCONARA 2005-06-02 20.15
> 507 16191 FALCONARA 2005-06-03 18.60
> 506 16191 FALCONARA 2005-06-02 20.15
> 507 16191 FALCONARA 2005-06-03 18.60
> 508 16191 FALCONARA 2005-06-04 22.30
> 509 16191 FALCONARA 2005-06-05 NA
> 510 16191 FALCONARA 2005-06-06 NA
> 511 16191 FALCONARA 2005-06-07 18.20
> 549 16206 GROSSETO 2005-06-01 20.65
> 550 16206 GROSSETO 2005-06-02 21.95
> 551 16206 GROSSETO 2005-06-03 22.25
> 552 16206 GROSSETO 2005-06-04 20.15
> 553 16206 GROSSETO 2005-06-05 NA
> 554 16206 GROSSETO 2005-06-06 NA
> 555 16206 GROSSETO 2005-06-07 22.35
> .....................................................................
> .....................................................................
>
>
> I need to rearrange tMedia into a new dataframe whose column
> names are COD_WMO
> (or NOME) and the row is DATE.
>
> ex.
> DATE ALGHERO BARI/PALESE .... FALCONARA
> GROSSETO ..........
> 2005-06-01 16.3 12.8 17.3
>
> 14.0 ...........
> 2005-06-02 18.2 8.9
> 18.0
> 17.9 ..........
> ..............................................................
> .................................
>
>
> I read some pieces of R-docs in the internet and run the MASS
> chapter 2
> examples but without finding anything suitable to my purpose.
>
> Could you please help me?
>
> Ciao
>
> Vittorio
>
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>
>
>



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Jun 23 01:47:37 2005

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