[R-sig-Geo] About extcoeff function.-
folopez at ivic.gob.ve
Mon Jun 7 16:42:12 CEST 2010
I have understood that the centre is located by considering the
distance in this sense: in the case [0,10], the axis varies from -10
to 10 and in the [100, 200] case goes from -200 to 200. Some ideas of
Thanks for your attention. I will wait some hours to write to package author.
On Mon, Jun 7, 2010 at 09:32, Michael Sumner <mdsumner at gmail.com> wrote:
> The runif function has arguments min/max:
> #function (n, min = 0, max = 1)
> So, in the first example the sampling is done in [0, 10] and the
> second in [100, 200] - so the approximate centre is (5,5) and (150,
> 150) respectively.
> In terms of the extcoeff function, the resulting plot centre is to do
> with the modelling process - some transformation that is not simply
> related to the actual coordinates of the data.
> Someone here may be familiar with this package, but in general terms
> the package author is perhaps a more appropriate target for your
> questions than this list. There is a vignette in the package, if you
> have not already read it:
> Cheers, Mike.
> On Tue, Jun 8, 2010 at 12:12 AM, Freddy López <folopez at ivic.gob.ve> wrote:
>> Dear All,
>> First of all, I present my apologise for this question. I'm sure this
>> has an easy solution; but I've no found one yet.
>> When I run the example of extcoeff function (in SpatialExtremes
>> library) I get a plot which axis are latitude and longitude, I
>> In that example the locations are created using:
>> locations <- matrix(runif(2*n.site, 0, 10), ncol = 2)
>> and I asume that for this reason the 'center' of the plot is about (0,0).
>> But (and around here emerge my doubts) if I replace the later locations by:
>> locations <- matrix(runif(2*n.site, 100, 200), ncol = 2)
>> I could imagine the 'center' of the plot is not (0,0) (perhaps about
>> (100,100)?) but this is not the case.
>> Why this question? Because I have a set of real locations with real
>> pluviometrical measures and the plot (extcoeff plot) is refering to
>> different coordinates (always around (0,0)).
>> I don't know if I have misunderstood the help page or something else.
>> Does anyone know what the problem is?
>> «But Gwindor answered: 'The doom lies in yourself, not in your name.'»
>> JRR Tolkien
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