[R] Probably dumb question about lists

[Raphael Päbst]

Thanks Boris!
I know that I am just leaving out some tiles in the plot, but I
specifically want to drop those tiles for the plot and not calculate a
tesselation without these points. So I'll go with this solution and
hope it makes sense in the end.

Thanks again!

Raphael

On 1/14/15, Boris Steipe <boris.steipe at utoronto.ca> wrote:
> plot.tile.list() expects its argument to be of class tile.list, and to have
> an attribute "rw", both of which are not conserved after subsetting. You can
> do ...
>
>
> if (!require(deldir)) {
>   install.packages("deldir")
>   library(deldir)
> }
> x <- rnorm(10)
> y <- rnorm(10)
> del <- deldir(x, y)
> tl <- tile.list(del)
>
> tl2 <- tl[1:4]
> class(tl2) <- "tile.list"
> attr(tl2, "rw") <- attr(tl, "rw")
> plot.tile.list(tl2)  # or just plot(tl2)
>
> BUT!
> This doesn't really make sense because you are just "randomly" plotting some
> tiles from the full triangulation, not plotting a triangulation with less
> points. That would be:
>
> plot(tile.list(deldir(x[1:4], y[1:4])))
>
> Cheers,
> B.
>
>
>
>
> On Jan 14, 2015, at 10:13 AM, Bert Gunter <gunter.berton at gene.com> wrote:
>
>> 1. Please in future specify the package (deldir here) that contains
>> the functions you refer to.
>>
>> 2. **Always** first try ?str before posting queries like this, as this
>> will often reveal the problem.
>>
>> str(tl[1:800])
>>
>> 3. I would **guess** (ergo could well be wrong) that "[" is not
>> preserving the class attribute of tl. Ergo you are getting the basic
>> plot method and not the plot.tile.list method.
>>
>> HTH.
>>
>> Cheers,
>>
>> Bert
>>
>> Bert Gunter
>> Genentech Nonclinical Biostatistics
>> (650) 467-7374
>>
>> "Data is not information. Information is not knowledge. And knowledge
>> is certainly not wisdom."
>> Clifford Stoll
>>
>>
>>
>>
>> On Wed, Jan 14, 2015 at 6:23 AM, Raphael Päbst <raphael.paebst at gmail.com>
>> wrote:
>>> Hello everybody!
>>> I feel very stupid right now but suspect it has something to do with
>>> tiredness. I am trying to drop the last couple of Elements from a list
>>> and this doesn't work as expected.
>>>
>>> My code looks something like this:
>>>
>>> del <- deldir(x, y)
>>> tl <- tile.list(del)
>>> plot(tl)
>>>
>>> Now, I only want to plot the first 800 elements of tl and can't work
>>> out how to do this.
>>> plot(tl[1:800])
>>> gives me an error "x is a list but does not have components x and y"
>>> which somewhat baffles me. I'm sure this is all due to lack of sleep
>>> but right now I feel very dumb and would welcome any pointers towards
>>> a solution for my problem.
>>>
>>> Many thanks!
>>>
>>> Raphael
>>>
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>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>
>