[R] Smoothing a persp graph

[David Winsemius]

On Jun 19, 2012, at 10:02 AM, David L Carlson wrote:

> kde2d is for two dimensional data. The persp graph is 3d.

Huh? The question asked about plotting data that was 2d. The third  
dimension was to be the density. kde2d in package MASS or the  
similarly named function in package KernSmooth would seem to be on  
point here.

-- 
David.


>
> Look at the StatDA package, particularly the Vignette for that  
> package,
> "Tutorial to the package StatDA" which discusses smoothing techniques
> and kriging:
>
> http://cran.r-project.org/web/packages/StatDA/vignettes/StatDA.pdf
>
> For more options look at the Spatial Task View:
>
> http://cran.r-project.org/web/views/Spatial.html
>
> ----------------------------------------------
> David L Carlson
> Associate Professor of Anthropology
> Texas A&M University
> College Station, TX 77843-4352
>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>> project.org] On Behalf Of Kehl Dániel
>> Sent: Tuesday, June 19, 2012 8:42 AM
>> To: r-help at r-project.org
>> Subject: Re: [R] Smoothing a persp graph
>>
>> Take a look at the
>>
>> kde2d
>> function in the MASS package, maybe it helps.
>>
>> Best
>> kd
>>
>>
>>
>> 2012.06.19. 14:26 keltezissel, Guillaume Chapron mrta:
>>> Hi,
>>>
>>> I'm unable to find a way to smooth data for a persp() graph.
>>>
>>> Example, suppose that I have data x,y,z like this:
>>>
>>> x<- 1:10
>>> y<- 1:10
>>>
>>> k<- 20
>>> z<- outer(x, y, "*") + matrix( k*runif(100, -1, 1), 10, 10)
>>> persp(x, y, z, theta = 35, phi = 25)
>>>
>>> The graph is not very nice. Is there a way to smooth the z data so
>> that at the end the graph would look more like something like that:
>>>
>>> k<- 2
>>> z<- outer(x, y, "*") + matrix( k*runif(100, -1, 1), 10, 10)
>>> persp(x, y, z, theta = 35, phi = 25)
>>>
>>> There seems to be many smoothing functions in R (e.g. loess) but I
>> have not been able to find one for a 3D graph.
>>>
>>> Thanks!
>>>
>>> Guillaume
>>>
>>> ______________________________________________
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>>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>>
>>>
>>
>>
>> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT