[R-sig-Geo] About extcoeff function.-

[Freddy López]

Thanks Michael,

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
symmetry...

Thanks for your attention. I will wait some hours to write to package author.

Cheers.

On Mon, Jun 7, 2010 at 09:32, Michael Sumner <mdsumner at gmail.com> wrote:
> The runif function has arguments min/max:
>
> args(runif)
> #function (n, min = 0, max = 1)
> #NULL
>
> 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:
>
> vignette("SpatialExtremesGuide")
>
> 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
>> understand.
>>
>> 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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>>
>
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-- 
«But Gwindor answered: 'The doom lies in yourself, not in your name.'»

JRR Tolkien