[R] pair correlation function of 3D points

Jeff Newmiller jdnewm|| @end|ng |rom dcn@d@v|@@c@@u@
Wed Apr 29 00:18:54 CEST 2020

Technically, per the Posting Guide, help for contributed packages is supposed to come through different channel(s) than R-help as indicated in their DESCRIPTION file (typically searchable thru the package CRAN page). In practice this rule tends to only get invoked when the OT traffic gets too high, but it may be a bit much to expect maintainers to patrol R-help permanently. Feel free to direct OT questions toward the relevant CRAN page or the resources mentioned there.

On April 28, 2020 3:07:39 PM PDT, Abby Spurdle <spurdle.a using gmail.com> wrote:
>I haven't attempted this.
>(Mainly because I'm not familiar with the theory surrounding it).
>However, I looked at the documentation for the spatstat package.
>There are are several functions prefixed with pcf, including one named
>According to its description field:
>          Estimates the pair correlation function
>          from a three-dimensional point pattern.
>*If* it does what it claims, would that solve your problem?
>Note (to spatstat authors):
>I'm not convinced this package is well documented.
>In fact, I'm not even convinced it meets CRAN standards, which require
>functions to have their arguments documented.
>     X
>    Three-dimensional point pattern (object of class "pp3").
>Nowhere in the help page, does it say what a pp3 object is, or how to
>create it, or where to find that information.
>Potentially requiring a user to search through a 1766 page document
>for the answer.
>(Yes, I know there's a function named pp3, but I don't think that's
>good enough).
>If people are not going to document their packages properly, they
>could try a little bit harder to answer R-help questions that involve
>their packages...
>On Tue, Apr 28, 2020 at 3:56 AM Labo Eric <leroy using icmpe.cnrs.fr> wrote:
>> Hi,
>> I have the coordinates of 3D points and I want to plot the pair
>> correlation function of these points
>> (https://en.wikipedia.org/wiki/Radial_distribution_function). I
>> if it possible to calculate this function with R. Maybe with the
>> spatstat library? I tried but I found the way to do this with 3D
>> but not for 3D points.
>> Could you help me ?
>> Thank you,
>> Best regards,
>> --
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>PLEASE do read the posting guide
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Sent from my phone. Please excuse my brevity.

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