extrapolating data points/surface between two 3D lines

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John
John 2014-7-28
评论： Star Strider 2014-7-29
Hello all! I have two data sets (x,y,z1) (x,y,z2) where x, y and z are all seperate vectors of length n. I can plot each data set together as a 3D line plot using: plot3(x,y,z1,x,y,z2), but I would also like to interpolate/extrapolate the linear surface which exists between these two lines, effectively creating a 3D surface plot. Is there a good way to do this?

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回答（1 个）

Star Strider
Star Strider 2014-7-28
Without seeing your data, it’s difficult to be specific. See if griddata (or its friends) will do what you want.
  2 个评论
John
John 2014-7-29
编辑：Star Strider 2014-7-29
The data is nothing special really, simply two 3D lines with equal number of points. for example
x = [ 1 2 3 ];
y = [ 1 2 3 ];
z1 = [ 4 4 5 ];
z2 = [ 1 2 8 ];
where line 1 is described by the points x,y,z1 and line 2 is described with the points x,y,z2. THe idea here is to create a surface between these lines.
Star Strider
Star Strider 2014-7-29
The problem (that I didn’t appreciate before) is that (z1, z2) are defined at the same points. If you plot them using stem3, z1 are simply plotted on the same stems as z2.
If x and y are actually the same (as they are in your example), I suggest you use a 2D plot, such as the area plot to get the effect you want.
I suggest you experiment with patch for a 3D version of it. The patch function requires some experimentation to get it to do what you want.
Examples:
figure(1)
patch(x, y, [ z1; z2 ], 'g')
grid
view([15 30])
figure(2)
patch([0 x 0], [0 y 0], [0 z1 0; z1(1) z2 z2(3)], 'b')
grid on
view([15 30])

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