[R-sig-Geo] spatstat - kppm function

[Fernanda De Bastiani]

Thank you very much for the information!

On 6 June 2017 at 19:43, Adrian Baddeley <adrian.baddeley at curtin.edu.au>
wrote:

> On 07/06/17 09:57, Fernanda De Bastiani wrote:
>
> >Dear Sir/Madam,
> >I am trying to use function kppm() of spatstat package with anisotropic
> >covariance option as the following:
> >#-------------------------------------------
> >    kppm(redwood, ~x, "LGCP", statistic="pcf",
> >covmodel=list(model="matern",
> >nu=0.3, Aniso = matrix(nc=2, c(1.5, 3, -3, 4))))
> >#-------------------------------------------
> >but it gives me an error message:
> >Error in rfInit(model = p, x = x, y = y, z = z, T = T, grid = grid,
> >distances = distances,  :
> >    'RFcov' :  'Aniso' : not of the required size: (2, 2) instead of
> >(undetermined, 1)
> >Please, could anyone help me to understand in which conditions nc=2 will
> >work?
>
> The kppm() function is designed for models whose pair correlation function
> is isotropic.
> It cannot be used to fit an anisotropic model.
>
> (Extending this to anisotropic models is conceivable but it would require
> new theory as well as completely new software).
>
> I¹m sorry about the opaque error message. I¹ll try to find a way to detect
> anisotropic models and give a more meaningful message from the spatstat
> code.
>
> Adrian Baddeley
>
>
>
>
>
>

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