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Topic: Drawing a Line From One Plot to Another
Replies: 5   Last Post: Aug 29, 2012 1:19 AM

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Alexander Elkins

Posts: 32
Registered: 4/13/09
Re: Drawing a Line From One Plot to Another
Posted: Aug 16, 2012 2:06 AM
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It is possible to do this using the Drawing Tools from the Graphics menu on
the output of GraphicsGrid.

Or use Get Coordinates from the context menu on the output of GraphicsGrid
and then go back and add an Epilog option to GraphicsGrid.
For example, based on Bob Hanlan's example:

y1[x_] = x^2;
y2[x_] = 2 x;
pts = {x, y1[x]} /. Solve[y1[x] == y2[x], x];
GraphicsGrid[{{Plot[Evaluate[Tooltip[y1[x]]], {x, -1, 3},
Frame -> True, Axes -> False,
Epilog -> {Text[#, #, {1, -2}] & /@ pts, Red,
AbsolutePointSize[4], Point[pts]}]}, {Plot[
Evaluate[Tooltip[y2[x]]], {x, -1, 3}, Frame -> True,
Axes -> False,
Epilog -> {Text[#, #, {-1, 2}] & /@ pts, Red,
AbsolutePointSize[4], Point[pts]}]}},
Epilog -> {Darker[Green], AbsoluteDashing[{10, 5}],
Arrow[{{113.5, -208.4}, {117.8, -397.4}}],
Arrow[{{272.1, -122.6}, {275.4, -299.6}}]}]

Hope this helps...

"Gregory Lypny" <> wrote in message
> Hello everyone,
> Say I have two plots, y=x^2 and y=2x, aligned vertically using

GraphicsColumn. Their domains are aligned because x runs from -3 to +3 in
both. I'd like to be able to draw a line from a point in the top graph to a
point in the bottom graph. How can I do that?
> Regards,
> Gregory

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