[R-sig-Geo] Mysterious (to me) behaviour of cbind() on an envelope -- ASDAR ch. 7

[marcelino.delacruz at upm.es]

Hi,

I  think this is because Gresuts is an fv object in adtition to a
data.frame. It has its own cbind.fv method.

>From the help.page of fv:

Use cbind.fv to combine several "fv" objects. Use bind.fv to glue
additional columns onto an existing "fv" object.

So you should use instead bind.fv...

Cheers


Marcelino


Con fecha 3/2/2012, "D G Rossiter" <rossiter at itc.nl> escribió:

>Dear r-sig-geo friends:
>
>I am working through ASDAR (Applied Spatial Data Analysis with R) book using the code and datasets on the book's website http://www.asdar-book.org/.
>
>In sppa_mod.R (code for Chapter 7) we are trying to bind a new column giving the point-pattern name to an object of class envelope:
>
>>  Gresults <- rbind(envjap, envred, envcells)
>>  class(Gresults)
>[1] "envelope"   "fv"         "data.frame"
>>  Gresults <- cbind(Gresults, DATASET=rep(c("JAPANESE", "REDWOOD", "CELLS"), each=length(r)))
>
>but somehow the newly-bound column does not get the assigned name 'DATASET', but is assigned the name 'y':
>
>> str(Gresults)
>Classes 'fv' and 'data.frame':  144 obs. of  6 variables:
> $ r   : num  0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 ...
> $ obs : num  0 0 0 0.0615 0.0615 ...
> $ theo: num  0 0.00509 0.02021 0.04491 0.07843 ...
> $ lo  : num  0 0 0 0 0 ...
> $ hi  : num  0 0.0625 0.0748 0.1427 0.1933 ...
> $ y   : Factor w/ 3 levels "CELLS","JAPANESE",..: 2 2 2 2 2 2 2 2 2 2 ...
>....
>
>somehow the envelope has been removed also. Then when I try to plot according to the following code:
>
>> print(xyplot(obs~theo|DATASET , data=Gresults, type="l", ...
>
>the classifying category is not found. If I replace DATASET with y the plot is shown as in Fig. 7.3.
>
>Clearly the cbind() is somehow not preserving the assigned column name, despite the class being build on data.frame. Where it gets the 'y' from is also seriously mysterious to me.
>
>Here's my version info. I started from a clean workspace and only loaded the packages as indicated.
>
>> version
>platform       x86_64-apple-darwin9.8.0
>arch           x86_64
>os             darwin9.8.0
>system         x86_64, darwin9.8.0
>status
>major          2
>minor          14.0
>year           2011
>month          10
>day            31
>svn rev        57496
>language       R
>version.string R version 2.14.0 (2011-10-31)
>
>Package:            sp
>Version:            0.9-94
>Date:               2011-12-21
>
>Package:            spatstat
>Version:            1.25-2
>Date:               2012-01-19
>
>Thanks for any insight!
>
>D. G. Rossiter
>Senior University Lecturer
>University of Twente, Faculty ITC
>Hengelosestraat 99
>PO Box 217, 7500 AE Enschede, the Netherlands (NL)
>Phone:  +31-(0)53 4874 499
>Fax:    +31-(0)53 4874 336
>mailto:rossiter at itc.nl,  Internet: http://www.itc.nl/personal/rossiter
>
>
>
>
>Faculty of Geo-Information Science and Earth Observation (ITC)
>University of Twente
>Chamber of Commerce: 501305360000
>
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