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1D Spline from 2D Skalar Field

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Florian Flaig
Florian Flaig 2022-4-11
评论： Florian Flaig 2022-4-12
Hello community,
I have a problem.
I have a 2D skalar-field and need support points to describe the red curve.
The red curve is any curve that projects a straight line onto the z=0 plane.
Below you can see a Plot of the 2D skalar-Flied, which I have as a matrix.
In addition, I have the mathematical description of the dark red line.
What are the z values of the light red line? (which I have inserted with Paint)
Thankyou for your Help.
Greetings, Florian

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采纳的回答

Florian Flaig
Florian Flaig 2022-4-12
copy of marc li:
OK, if your surface data are X, Y and Z and your dark red line data are x and y, you can get data of the red line about z axis:
z = interp2(X,Y,Z,x,y);
and plot the red line:
hold on;
plot3(x,y,z)

更多回答（1 个）

mark li
mark li 2022-4-11
You may get information of the curve by handles.
Firstly, you get the handle of the figure by gcf, the figure have three children which are a surface and two lines. The code is shown as
Child = get(gcf, 'Children');
The Child may be 3x1 handles, and you can :
get(child(1)), get(child(2)), get(child(3))
According to result, you select proper index.
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mark li
mark li 2022-4-12
OK, if your surface data are X, Y and Z and your dark red line data are x and y, you can get data of the red line about z axis:
z = interp2(X,Y,Z,x,y);
and plot the red line:
hold on;
plot3(x,y,z)
Florian Flaig
Florian Flaig 2022-4-12
Thank you very mouch marc. Now it works. :-)

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