[R] empty density plot for point pattern in spatstat

[MacQueen, Don]

On my system (see info at the end) the plot succeeds.

Can you plot other objects of class "im"?
(see ?im for examples)


Has it even been determined if the problem is with (a) the plotting
process, or (b) the structure of the object being plotted?


To check the structure of the object, you might wish to compare with:

> tmp <- density(redwood)
> class(tmp)
[1] "im"

> str(tmp)
List of 10
 $ v     : num [1:128, 1:128] 12.8 13.2 13.7 14.2 14.7 ...
 $ dim   : int [1:2] 128 128
 $ xrange: num [1:2] 0 1
 $ yrange: num [1:2] -1 0
 $ xstep : num 0.00781
 $ ystep : num 0.00781
 $ xcol  : num [1:128] 0.00391 0.01172 0.01953 0.02734 0.03516 ...
 $ yrow  : num [1:128] -0.996 -0.988 -0.98 -0.973 -0.965 ...
 $ type  : chr "real"
 $ units :List of 3
  ..$ singular  : chr "unit"
  ..$ plural    : chr "units"
  ..$ multiplier: num 1
  ..- attr(*, "class")= chr "units"
 - attr(*, "class")= chr "im"
 - attr(*, "sigma")= num 0.125



Using tmp as created above, does
   image(list(x=tmp$xcol, y=tmp$yrow, z=t(tmp$v)),asp=1)
succeed?




> version
               _   
platform       x86_64-apple-darwin10.8.0
arch           x86_64
os             darwin10.8.0
system         x86_64, darwin10.8.0
status             
major          3   
minor          0.2 
year           2013
month          09  
day            25  
svn rev        63987
language       R   
version.string R version 3.0.2 (2013-09-25)
nickname       Frisbee Sailing

spatstat 1.36-0


-- 
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 6/17/14 2:23 PM, "Rolf Turner" <r.turner at auckland.ac.nz> wrote:

>On 18/06/14 03:49, Christopher W Ryan wrote:
>> I upgraded to version 3.1.0 of R, still on Win XP, but that did not
>> solve the problem:
>>
>> library(spatstat)
>> data(redwood)
>> str(redwood)
>> plot(redwood)  # works OK
>> plot(Kest(redwood))  # works OK
>> plot(density(redwood))  # produces an "empty" plot
>>                                         # with just the figure border
>>                                         # and a thin vertical box for
>> the color ramp
>>                                         # but no color ramp in it
>>
>> Any other ideas? I'd be much obliged.
>
>I have had an inquiry of this nature previously and sad to say was
>completely unable to find a solution.  I made numerous suggestions to
>the inquirer, e.g.:
>
>*looking for a plot.im() function masking the "real"
>plot.im() function from spatstat
>
>* cleaning out the global environment
>(.RData) in case there were some "artefacts" hanging around that had an
>impact on plot.im()
>
>* completely *removing* .RData and starting again,...
>
>Nothing worked.
>
>It is very difficult to diagnose a problem like this remotely.  If you
>could find an R guru who was able to come and sit with you at your
>computer it is ***just possible*** that they could track down what is
>going wrong.
>
>However it seems to me that the problem is due to some sort of
>recalcitrance of the Windoze system and is thus probably insoluble.
>
>I am cc-ing this to the person who made the previous inquiry.  Pablo,
>have there been any further developments since we last communicated
>about this problem?
>
>cheers,
>
>Rolf Turner
>
>P. S. BTW Chris:  Does plot.im() screw up with other images?  E.g. what
>happens if you do
>
>with(bei.extra,plot(elev))
>
>???
>
>R. T.
>
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