Timeline for Examining the function $f(x,y)=xy(x^2-y^2)/(x^2+y^2)$

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Jul 15, 2015 at 4:29	comment	added	David		You are right. I didn't have the sound on my computer up loud enough, so I didn't hear the beep. Now I do. You suggestions works, though the image is a little strange. Not a perfect circle.
Jul 14, 2015 at 21:28	comment	added	Michael E2		@David By "res no longer existed," you perhaps meant that your kernel crashed. At least mine did. But it seems to work if you take it in stages: `dom = res[[3]]; Block[{d = 1/50}, newdom = dom]; RegionPlot[newdom, {x, -1/3, 1/3}, {y, -1/3, 1/3}]`. Crashing with `RegionPlot` is not unfamiliar to me, but I don't know why it did. In this version `dom` is evaluated once and for all and the result stored in `newdom`. In the other code, `dom` is reevaluated many times. I don't know why that would matter, though.
Jul 14, 2015 at 21:12	comment	added	David		I gave this a try with: `dom = res[[3]]; Block[{d = 1/50}, RegionPlot[dom, {x, -1/3, 1/3}, {y, -1/3, 1/3}] ]`, but it didn't work. And after executing this command, res no longer existed.
Jul 14, 2015 at 18:22	vote	accept	David
Jul 14, 2015 at 17:54	history	undeleted	Michael E2
Jul 14, 2015 at 17:54	history	deleted	Michael E2		via Vote
Jul 14, 2015 at 17:52	history	answered	Michael E2	CC BY-SA 3.0