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

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
        |                    |
        |                    |
        |                    |
        |                    |
        |                    |
        |                    |
        |                    |
        |                    |
        |                    |
        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.

Answer 1

[Sean de Wolski]

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)