Thank you for your response and assisting me with clarifying my question. Here
is a portion of the code I am using:
xxx04 <- ppp(x=mpb04$Easting, y=mpb04$Northing, window=tpi1.win)
dens2004<-density(xxx04)
save(dens2004, file="dens2003.Rdata"
dens2004.load<-load("dens2004.Rdata")
dens2004.im<-as.im(dens2004.load, W=tpi1.win)
fm <- ppm(xxx04, ~x + y + density, Poisson(), covariates=list(dens2004.load)
#"Error in model.frame.default(formula=fmla, data=glmdata, subset=(.mpl.SUBSET
== : invalid type(closure) for variable 'density')
I hope this elucidates the problem further. Any help you can provide would be
wonderful. Thank you.
Sincerely,
Honey-Marie de la Giroday
> Date: Tue, 24 Jun 2008 11:40:42 +0200
> From: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
> CC: r-sig-geo@stat.math.ethz.ch
> Subject: Re: [R-sig-Geo] Coercing character to image
>
> On Tue, 24 Jun 2008, Honey Giroday wrote:
>
> >
> >
> > Hi,
> >
> > I'm currently trying to use save() on a density plot (i.e. an image)
> > that takes a long time to generate (using density(x)). I want to be
> > able to use the saved dataset as a covariate in ppm. However, once my
> > image is saved and loaded back in it is a character object instead of an
> > image. I tried using as.im to coerce the object to an image; however, I
> > get an error message.
> >
> > Does anyone have a method for converting a character object to an image
> > object?
>
> No, because you have not provided a code example to show what you did
> (wrong). Please create an example using a data set included in spatstat,
> reproducing your problem. We cannot see over your shoulder. My guess is
> that your question is not the right question, because the problem arose
> earlier in the workflow.
>
> Roger
>
> >
> > Sincerely,
> >
> >
> >
> >
> >
> >
> > Honey-Marie de la Giroday
> >
> > _________________________________________________________________
> >
> >
> > [[alternative HTML version deleted]]
> >
> > _______________________________________________
> > R-sig-Geo mailing list
> > R-sig-Geo@stat.math.ethz.ch
> > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >
>
> --
> Roger Bivand
> Economic Geography Section, Department of Economics, Norwegian School of
> Economics and Business Administration, Helleveien 30, N-5045 Bergen,
> Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
> e-mail: [EMAIL PROTECTED]
>
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