Problems with persist-results.R

Question

After running all the chain with absolutely no errors and when I go to data > explorer tab in the app I find that the variables I created on the chain do actually exist (for example density, basal area, etc.) but they are completely empty. It happens the same when I export the data to an excel file. Anyone experienced something similar? Bests

Answer 1 · 2026-03-05T15:03:15

Dear Juak,

can you please check in RStudio project that 1) you have given the area scripts in the /sampling folder, and that 2) none of the result attributes is containing just NAs. If any of variables in your chain contains only NAs, then persists-results.R fails. Also 3) after running system/calculate-results.R, that "per hectare" result variables are ok, (i.e., if in your chain you have tree$tree_basal_area, there will be a new variable tree$tree_basal_area_ha)

I just test one of my chains and persists-results.R worked. If the problem gets not solved, please contact us again so we can look at your case in detail.

regards, Lauri (OF Arena Team)

Answer 2 · 2026-03-05T15:24:51

Hi Lauri,

thanks for your fast reply. I answer to your question one by one:

area scripts are there
there are some variables with some NAs but no variable contains only NAs
in my entity tree (example) when I check it on R I obtain satisfactory results in the variable called tree$basal__area__ha

My problem is that in R everything looks nice and when I run persist-results.R everything goes smooth but then nothing gets into my survey back in Arena.

Best regards, Jokin

Answer 3 · 2026-03-09T07:50:21

0

Accepted answer

Dear Jokin,

a new version of Arena has been released, with a fix that solves the problem reported. Thank you for reporting the issue.

Problems with persist-results.R

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