how to create a surf plot for {x, y, z} where z is also a vector, thanks all!

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David Zhang
David Zhang 2012-2-13
Hi all, my problems are This is a simple mesh with four points 1,2 3 and 4, whose coordination are (x1, y1),...,(x4, y4), now i have the coordination values at X axis and y
node_x=[x1, x2, x3, x4]; node_y=[y1, y2, y3, y4]; and the z value for each point as
node_z=[z1, z2, z3, z4];
4--------------------3
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1--------------------2
I have to get a surf plot of these mesh points, however, my z values are not a matrix but a vector, do any body know how to create this surf plot?
For this matlab code as
clear clc node_x=[0, 20, 20, 0]; node_y=[0, 0, 20, 20]; node_z=[0.4, 0.4, 0.3, 0.3]
Thanks a lot.

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Sean de Wolski
Sean de Wolski 2012-2-13
You need to have points as 2d matrices in order to use mesh or surf. Look into meshgrid and interp2 to get your points onto a grid. For simples cases like this, you might prefer to just call patch directly.
node_x=[0, 20 20, 0];
node_y=[0, 0 20, 20];
node_z=[0.4, 0.4 0.3, 0.3];
patch(node_x,node_y,node_z,node_z)

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