[R-sig-Geo] Reading text files in Spatstat

[ONKELINX, Thierry]

I've found your problem. Test must be a matrix and you probably have a
data.frame.
I hope you see the importance of a reproducibel example of your code.
You MUST define the data too.


This works.

> test <- matrix(runif(20, 0, 10), ncol = 2)
> as.ppp(test,c(0,10,0,10),fatal=TRUE)
 planar point pattern: 10 points 
window: rectangle = [0, 10] x [0, 10] units 

This doesn't work.

> test <- data.frame(test)
> as.ppp(test,c(0,10,0,10),fatal=TRUE)
Error in as.ppp.default(test, c(0, 10, 0, 10), fatal = TRUE) : 
        Can't interpret X as a point pattern


Cheers,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be 

Do not put your faith in what statistics say until you have carefully
considered what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney

 

> -----Oorspronkelijk bericht-----
> Van: Taylor, RB [mailto:rbt501 at york.ac.uk] 
> Verzonden: dinsdag 3 juli 2007 17:32
> Aan: ONKELINX, Thierry
> CC: r-sig-geo at stat.math.ethz.ch
> Onderwerp: Re: [R-sig-Geo] Reading text files in Spatstat
> 
> Ok, "test" is just a small test data set of x, y coords.
> 
> 3.45	5.34
> 2.78	5.67
> 3.89	1.345
> 2.34	3.78
> 3.45	5.34
> 2.78	5.67
> 3.89	1.345
> 2.34	3.78
> 
> 
> You could make it easily in Excel or a similar program. x 
> coords are in the first column, y coords are in the 2nd 
> column. It is saved as a tab delimited text file called "test".
> 
> 
> Cheers,
> Rob
> 
> ONKELINX, Thierry wrote:
> > The problem is probably in "test". Try to give us a (small) 
> sample of 
> > test so we can reproduce your problem. Otherwise it will be hard to 
> > discover the problem.
> > 
> > Thierry
> > 
> > 
> ----------------------------------------------------------------------
> > --
> > ----
> > ir. Thierry Onkelinx
> > Instituut voor natuur- en bosonderzoek / Research Institute 
> for Nature 
> > and Forest Cel biometrie, methodologie en kwaliteitszorg / Section 
> > biometrics, methodology and quality assurance Gaverstraat 4 9500 
> > Geraardsbergen Belgium tel. + 32 54/436 185 
> Thierry.Onkelinx at inbo.be 
> > www.inbo.be
> > 
> > Do not put your faith in what statistics say until you have 
> carefully 
> > considered what they do not say.  ~William W. Watt A statistical 
> > analysis, properly conducted, is a delicate dissection of 
> > uncertainties, a surgery of suppositions. ~M.J.Moroney
> > 
> >  
> > 
> >> -----Oorspronkelijk bericht-----
> >> Van: r-sig-geo-bounces at stat.math.ethz.ch
> >> [mailto:r-sig-geo-bounces at stat.math.ethz.ch] Namens Taylor, RB
> >> Verzonden: dinsdag 3 juli 2007 17:11
> >> Aan: r-sig-geo at stat.math.ethz.ch
> >> Onderwerp: Re: [R-sig-Geo] Reading text files in Spatstat
> >>
> >> Right, I have supplied the W argument now. Still no joy though....
> >>
> >>  > as.ppp(test,c(0,10,0,10),fatal=TRUE)
> >> Error in as.ppp.default(test, c(0, 10, 0, 10), fatal = TRUE) :
> >>          Can't interpret X as a point pattern
> >>
> >> Any ideas anyone?
> >>
> >> Rob
> >>
> >> Don MacQueen wrote:
> >>> The help page for as.ppp() explains that in a case like
> >> yours (or what
> >>> I assume is yours from your description), you also need to
> >> supply the
> >>> W argument.
> >>>
> >>> Try looking at the help page for the ppp() function.
> >>>
> >>> -Don
> >>>
> >>> At 1:13 PM +0100 7/3/07, Taylor, RB wrote:
> >>>> Hello all,
> >>>>
> >>>> I have x,y data with an associated mark. Is there a 
> simple way of 
> >>>> getting Spatstat to read this data? I have tried putting 
> the x, y 
> >>>> data in separate columns in Excel and ignoring the marks,
> >> saving it
> >>>> as a tab-delim text file (called "test"). However the
> >> as.ppp function
> >>>> fails to convert it into a ppp object.
> >>>>
> >>>>
> >>>>  > test <- read.table("C:/temp/Rtest.txt")  > as.ppp(test)
> >> Error in
> >>>> as.ppp.default(test) : Can't interpret X as a point pattern
> >>>>
> >>>>
> >>>> Perhaps someone can answer my simple question and tell me
> >> what I am
> >>>> doing wrong?
> >>>>
> >>>> Thanks,
> >>>> Rob
> >>>> --
> >>>>
> >>>> _______________________________________________
> >>>> R-sig-Geo mailing list
> >>>> R-sig-Geo at stat.math.ethz.ch
> >>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >>>
> >> --
> >> Rob Taylor
> >>
> >> University of York
> >> Biology Department
> >> PO Box 373
> >> York
> >> YO10 5YW
> >> United Kingdom
> >>
> >> Work +44 (0)1904 32 8557
> >> Mob  +44 (0)777 258 5390
> >>
> >> _______________________________________________
> >> R-sig-Geo mailing list
> >> R-sig-Geo at stat.math.ethz.ch
> >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >>
> > 
> 
> --
> Rob Taylor
> 
> University of York
> Biology Department
> PO Box 373
> York
> YO10 5YW
> United Kingdom
> 
> Work +44 (0)1904 32 8557
> Mob  +44 (0)777 258 5390
>