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ContourPlot[{1.5 x^2 + 2 x y - 1.5 y^2, x^2 - 3 x y - y^2}/5, {x, -10,
   10}, {y, -10, 10}, ContourStyle -> {Red, Dashed}, Frame -> False,
Axes -> True, ContourShading -> None,
PlotLegends -> {"\[Psi](x,y)", "\[Phi](x,y)"}]

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xzczd

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CODE:
ContourPlot[{1.5 x^2 + 2 x y - 1.5 y^2}/5, {x, -10,10}, {y, -10, 10}, ContourStyle -> {Red}, Frame -> False,Axes -> True, ContourShading -> None,PlotLegends -> {"\[Psi](x,y)"}]
ContourPlot[{x^2 - 3 x y - y^2}/5, {x, -10,10}, {y, -10, 10}, ContourStyle -> {Dashed}, Frame -> False,Axes -> True, ContourShading -> None,PlotLegends -> { "\[Phi](x,y)"}]
Show[%%,%]

mathematicaÖÐContourPlotº¯Êý»æÍ¼ legend²»ÄÜÏÔʾ-2
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xzczd

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CODE:
contour[expr_, color_] :=
ContourPlot[expr, {x, -10, 10}, {y, -10, 10}, ContourStyle -> color,
  ContourShading -> None]

Show@MapThread[
   contour, {{1.5 x^2 + 2 x y - 1.5 y^2, x^2 - 3 x y - y^2}/5, {Red,
     Dashed}}] /.
Graphics[a__] :>
  Legended[Graphics[a],
   Placed[LineLegend[{Red, Dashed}, {"\[Psi](x,y)", "\[Phi](x,y)"}],
    After]]

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NicoleLas

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kabaisun

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3Â¥: Originally posted by NicoleLas at 2015-01-07 15:17:29
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kabaisun

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ÒýÓûØÌû:
4Â¥: Originally posted by xzczd at 2015-01-07 15:20:05
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NicoleLas

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ÒýÓûØÌû:
4Â¥: Originally posted by xzczd at 2015-01-07 15:20:05
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contour :=  ...

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Be water, my friend.
7Â¥2015-01-07 16:28:58
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NicoleLas

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xzczd

ľ³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
7Â¥: Originally posted by NicoleLas at 2015-01-07 16:28:58
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xzczd

ľ³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
7Â¥: Originally posted by NicoleLas at 2015-01-07 16:28:58
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