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I want to fill the region between two straight lines without displaying the region boundaries. How can it be done?

ContourPlot[{x == 2, x == 4}, {x, -2, 8}, {y, -2, 6}]

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3 Answers 3

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Use BoundaryStyle -> None as shown in the documentation of RegionPlot:

RegionPlot[2 <= x <= 4, {x, -2, 8}, {y, -2, 6}, BoundaryStyle -> None]

enter image description here

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  • $\begingroup$ Thanks, @Roman. It's working. $\endgroup$ Oct 3, 2022 at 8:53
  • $\begingroup$ Just saw your answer after I updated. $\endgroup$
    – Nasser
    Oct 3, 2022 at 8:59
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is this what you mean?

p1 = ContourPlot[{x == 2, x == 4}, {x, -2, 8}, {y, -2, 6}];
r = ImplicitRegion[2 < x < 4 && -2 < y < 6, {x, y}];
p2 = RegionPlot[r];
Show[p1, p2]

Mathematica graphics

Update

In this case, just plot the region directly. No need for ContourPlot at all to be there.

r = ImplicitRegion[2 < x < 4 && -2 < y < 6, {x, y}];
RegionPlot[r, BoundaryStyle -> None, 
 PlotRange -> {{-2, 8}, Automatic}]

Mathematica graphics

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  • $\begingroup$ Thanks, @Nasser for your answer. You are almost close. I just don't want the border lines surrounding the region. $\endgroup$ Oct 3, 2022 at 8:50
  • $\begingroup$ @SahabubJahedi fyi, updated $\endgroup$
    – Nasser
    Oct 3, 2022 at 8:59
  • $\begingroup$ Thanks, @Nasser, it's working. $\endgroup$ Oct 3, 2022 at 12:05
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c := RandomInteger[{-100, 100}];

RegionPlot[RegionIntersection[
  HalfPlane[{{2, c}, {2, c}}, {1, 0}]
  , HalfPlane[{{4, c}, {4, c}}, {-1, 0}]
  ]
 , Frame -> True
 , BoundaryStyle -> None
 , PlotRange -> { {-2, 8}, {-2, 6}}
 ]

enter image description here

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