[R] rotate levelplot

[David Winsemius]

On Oct 25, 2009, at 1:51 AM, Kang Min wrote:

> Hi Milton,
>
> The matrix can be generated using
>
> p = matrix(1:50, nrow=5)
>
> If I just use levelplot(p), it gives me a graph that is vertical. How
> can I rotate it so it becomes horizontal?
> I cannot do
>
> q = t(p); levelplot(q)
>
> because this is representing a map from a piece of land, transposing
> the data will flip the map upside down laterally.

You can reverse the order of the indices. I cannot quite figure out  
which reversal will accomplish your goals because your description  
seems ambiguous but take a look at the output of htese and you should  
be able to apply hte strategy to your situation:

  library(lattice)
#as a courtesy to the helpeRs it's nice to reference the package in  
which you function resides

  p = matrix(1:50, nrow=5)
  q2 = p[5:1, ] ; levelplot(q2)

  levelplot(p)

  q = t(p)
  levelplot(q[10:1, ])

-- David

>
> Thanks,
> Kang Min
>
> On Oct 25, 12:40 pm, milton ruser <milton.ru... at gmail.com> wrote:
>> Hi Kang,
>>
>> Could you send a reproducible sample-code?
>>
>> Bests
>>
>> miltinho
>>
>>
>>
>> On Sat, Oct 24, 2009 at 11:32 PM, Kang Min <ngokang... at gmail.com>  
>> wrote:
>>> Hi all,
>>
>>> I have a matrix with 5 rows and 10 columns, which represent the  
>>> grids
>>> on a rectangular map.
>>> I used the code below to plot, but it gives me the map with the 10
>>> columns as y-axis, and the 5 rows as the x-axis, and the (0,0) point
>>> is at the usual bottom left hand corner. My map starts with the  
>>> (0,0)
>>> at the top left hand corner.
>>
>>> How can I rotate the map 90 degrees clockwise so the (0,0) starts at
>>> the top left? That means I need the 10 columns to be x-axis. I  
>>> cannot
>>> transpose the matrix because the map would be laterally flipped  
>>> over.
>>
>>> levelplot(quadsec.mat, colorkey=list(space="bottom"), scales=list
>>> (tick.number=10), aspect=c("iso"))
>>
>>> Thanks, I'm ready to give more information if needed.
>>
>>> Kang Min
>>
>>> ______________________________________________
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>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html 
>>> >
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-h... at r-project.org mailing listhttps://stat.ethz.ch/mailman/ 
>> listinfo/r-help
>> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> 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
Heritage Laboratories
West Hartford, CT