I conducted a GRASS GIS course this week and we found some bugs on WinGRASS:

r.mapcalc expression=if(case1,if(case2,Val2True,Val2False),Val1False))

This expression will fail, note that the lack of quote is intentional, as it is 
a requirement to run simpler r.mapcalc statements in WinGRASS.

Also, we found that the use of || and && within a simple conditional statement 
also did not process anything and failed.

We had 25% Mac overall (group of 110 students), we installed the new aconda 
7.5dev and all the above processing worked perfectly. We also had an Ubuntu 
machine (not mine) with Artful default grass install (7.4?) which performed as 
well as the Mac, nothing much to say except from the render.py bug in d.rast 
inside a d.mon (submit ticket last week 
https://trac.osgeo.org/grass/ticket/3497).

We used the tutorial in grass=promo/tuorials/grassstarter, the script at the 
end essentially, running on Spearfish dataset.

Yann
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