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When I try to create a ContourPlot of a continuous conditional function, Mathematica leaves a "seam" in between the two regions demarcated by the conditional. How do I fill this seam?

fn[x_, y_] := If[x < 2, y/x^2, y/(2 x)]
ContourPlot[fn[x, y], {x, 1.5, 2.5}, {y, 0, 2}]

enter image description here

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  • $\begingroup$ The PlotPoints -> 500 option helps. $\endgroup$
    – user64494
    Sep 16, 2020 at 7:48
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    $\begingroup$ add the option Exclusions -> None? $\endgroup$
    – kglr
    Sep 16, 2020 at 7:50
  • $\begingroup$ @kglr, that seems to solve the problem. Feel free to write up an answer to my trivial question and I'll mark it answered. $\endgroup$
    – Corvus
    Sep 16, 2020 at 7:59

1 Answer 1

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Adding the option Exclusions -> None fixes the issue:

 ContourPlot[fn[x, y], {x, 1.5, 2.5}, {y, 0, 2}, Exclusions -> None]

enter image description here

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  • $\begingroup$ Thank you so very much! $\endgroup$
    – Corvus
    Sep 16, 2020 at 9:16

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