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Bug introduced in 11.2. Fixed in 12.2.0 or earlier.

Ω = 
  RegionDifference[Rectangle[{0, 0}, {100, 100}], 
   Rectangle[{40, 40}, {60, 60}]];
RegionPlot[Ω]

DensityPlot[x^2 + y^2, {x, y} ∈ Ω]

when I run it in v11.2 I got

enter image description here

while I run it in v11 I got

enter image description here

so is it a bug?

Improve this question
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  • 1
    $\begingroup$ (Please only use the bugs tag for bugs confirmed by the community. Read the tag info page for more details) $\endgroup$
    – user202729
    May 19, 2018 at 3:44
  • $\begingroup$ (observation: note the "0..2" labels on the axes. The data is correct, the PlotRange detection is unexpected) $\endgroup$
    – user202729
    May 19, 2018 at 4:00
  • $\begingroup$ @user202729 yes,the range is different ,but in v11 it runs out the correct range automaticly so in v11.2 we should operate mannually? $\endgroup$
    – dcydhb
    May 19, 2018 at 4:02
  • $\begingroup$ @user202729 also we can use the RegionPlot rather than DensityPlot so we must set the range mannually? $\endgroup$
    – dcydhb
    May 19, 2018 at 4:04
  • $\begingroup$ I consider it a bug. A workaround is RegionPlot[\[CapitalOmega], PlotRange -> {{0, 100}, {0, 100}}] and DensityPlot[x^2 + y^2, {x, 0, 100}, {y, 0, 100}, RegionFunction -> Function[{x, y, f}, {x, y} \[Element] \[CapitalOmega]]] $\endgroup$
    – Bob Hanlon
    May 19, 2018 at 4:17

1 Answer 1

Reset to default
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Edit: according to the comment by @kirma it is fixed already since 12.2

Update from 13.2.0

With

Ω = 
  RegionDifference[Rectangle[{0, 0}, {100, 100}], 
   Rectangle[{40, 40}, {60, 60}]];
RegionPlot[Ω]
DensityPlot[x^2 + y^2, {x, y} ∈ \[CapitalOmega]]

we get

pp1

pp2

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2
  • 1
    $\begingroup$ This also seems to work on v12.2, might have been fixed even earlier... $\endgroup$
    – kirma
    Feb 4 at 9:16
  • 1
    $\begingroup$ @kirma I just saw you updated the bugs header. Thanks a lot for that and for letting me know! $\endgroup$
    – bmf
    Feb 4 at 9:17

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