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

Andy Teucher @ndy@teucher @end|ng |rom gm@||@com
Wed Oct 23 18:30:58 CEST 2019

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’

Andy Teucher

> On Oct 23, 2019, at 8:28 AM, Micha Silver <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
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