[R-sig-Geo] Implementing a rolling window for stars object

[Edzer Pebesma]

Thanks for reporting Micha, and creating a reprex on github Andy; the
problem seems to be fixed, now.

Best regards,

On 10/23/19 2:22 PM, Andy Teucher wrote:
> I’m fairly certain this is a bug in stars; I opened an issue here: https://github.com/r-spatial/stars/issues/223 <https://github.com/r-spatial/stars/issues/223>
> 
> Cheers,
> Andy Teucher
> 
>> On Oct 23, 2019, at 10:42 AM, Andy Teucher <andy.teucher using gmail.com> wrote:
>>
>> Interesting - there’s some rlang/tidy evaluation trickery going on there that I couldn’t quite figure out (I think it might be searching for yr in the wrong environment), but defining your range as a single variable, and putting that in the square brackets seems to work for me:
>>
>> rng <- yr:last_yr
>> stars_window = ci_stars[,,,rng]
>>
>>
>>> On Oct 23, 2019, at 10:20 AM, Micha Silver <tsvibar using gmail.com> wrote:
>>>
>>>
>>> On 23/10/2019 19:30, Andy Teucher wrote:
>>>> Hi Micha,
>>>>
>>>> I can see two problems immediately with your code:
>>>> 1. you are using a double-colon (yr::last_yr) - the double colon is used for looking for an object in a package, so it is looking for object ‘yrs’ in package ‘yr’, which obviously doesn’t make sense. Use a single colon to create a range (like you did with 2:6)
>>>> 2.  the object ‘last_yr’ is never defined, so even if you used a single colon to define the range yr:last_yr, it would fail as it would not be able to find object ‘last_yr’
>>>>
>>>
>>> Thanks,
>>>
>>> I fixed those typos (corrected script attached) and I still get this error:
>>>
>>>
>>> micha using tp480:R$ Rscript stars_window.R
>>> Loading required package: abind
>>> Loading required package: sf
>>> Linking to GEOS 3.7.1, GDAL 2.4.0, PROJ 5.2.0
>>> Error in eval(rlang::expr(x[[i]][!!!args])) : object 'yr' not found
>>> Calls: RunMK -> [ -> [.stars -> structure -> eval -> eval
>>> Execution halted
>>>
>>>
>>>
>>>> Cheers,
>>>> Andy Teucher
>>>>
>>>>> On Oct 23, 2019, at 8:28 AM, Micha Silver <tsvibar using gmail.com <mailto:tsvibar using gmail.com>> wrote:
>>>>>
>>>>> I am trying to run a function (mk.test to find MannKendall trends) using st_apply over a "rolling" window for a time series of rasters in a stars object.
>>>>> When I use subscript notation to slice out the window dimension with a looping variable I get an error:
>>>>>
>>>>> Error in loadNamespace(name) : there is no package called ‘yr’
>>>>> Calls: [ ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
>>>>> Execution halted
>>>>>
>>>>> However If I replace the subscript with integers it works fine. (see attached)
>>>>> What is the correct way to work this out?
>>>>>
>>>>> Attached is a reprex with a small subset of my data. (The script starts with a long structure, code is at the end)
>>>>>
>>>>> Thanks
>>>>> --
>>>>> Micha Silver
>>>>> Ben Gurion Univ.
>>>>> Sde Boker, Remote Sensing Lab
>>>>> cell: +972-523-665918
>>>>> <stars_window.R>_______________________________________________
>>>>> R-sig-Geo mailing list
>>>>> R-sig-Geo using r-project.org <mailto:R-sig-Geo using r-project.org>
>>>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>>>
>>> -- 
>>> Micha Silver
>>> Ben Gurion Univ.
>>> Sde Boker, Remote Sensing Lab
>>> cell: +972-523-665918
>>>
>>> <stars_window.R>
>>
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics
Heisenbergstrasse 2, 48151 Muenster, Germany
Phone: +49 251 8333081

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