Intersection points of two contour plots

• To: mathgroup at smc.vnet.net
• Subject: [mg130665] Intersection points of two contour plots
• From: Luiz Melo <lmelo at ufsj.edu.br>
• Date: Wed, 1 May 2013 03:36:14 -0400 (EDT)
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• Delivered-to: l-mathgroup@wolfram.com
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```Hi group,
Please consider the example below to illustrate my question (the
original problem is somehow much more complicated):

t1 = Table[Sin[3 x*y], {x, -3, 3, .1}, {y, -3, 3, .1}];

t2 = Table[If[x*y < 0, Sin[3 x*y]], {x, -3, 3, .1}, {y, -3, 3, .1}];

p1 = ListContourPlot[t1, Contours -> {0}, ContourShading -> False,
DataRange -> {{-3, 3}, {-3, 3}}, ContourStyle -> Black];

p2 = ListContourPlot[t2, Contours -> {0}, ContourShading -> False,
DataRange -> {{-3, 3}, {-3, 3}}, ContourStyle -> {Red, Dashed, Thick}];

Show[p1, p2]

Is there a way to show only the results of the intersection of these
two contour plots?

Thank you
Luiz

```

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