How can I plot various vectors together with surf or mesh when they have different x, y and z values?

Hello,

assuming I have 4 times of these two vectors

G=[-1  2  5 -3  3  4]  %(x)
P=[36 45 23 54 56 23]  %(y)

G=[2  -3  5 -3  3  1]  
P=[46 23 45 79 23 12]

G=[2  2  -3 2  3  -1]
P=[36 45 23 54 56 23]

G=[-1  -4  -4 -3  3  2]
P=[36 37 14 54 56 56]

each and every pair gives you a plot if you just do plot(G,P)

What I want to do is plot them on a mesh or surf so that X axis will have the P values Y axis will have the G values for each P and the Z axis will just be a number from 1:4 or as many the plots are.

my thoughts up to now come to interpolation in order to fix all the P values somehow , but I really do not know how to do it.

Any suggestions?

/Andreas T.

Answer 1

[Sreeja Banerjee]

Hi Andreas,

From your question I understand that you have two 1D vectors G and P. These vectors can have different values at different instances, for example, in the question you have mentioned 4 different pairs of G and P. You want to create a surface plot with these two vector and have the four different values shown on four different levels (z-axis).

Since G and P are only 1D vectors, we cannot create a surface plot which them. However, we can use the function MESHGRID to create a rectangular grid in 2-D. I have shown below a simple exmple on how you can do that:

G=[-1  2  5 -3  3  4];  
P=[36 45 23 54 56 23];

[x,y] = meshgrid(G,P);
z = 0*x + 1;
surf(x,y,z,'Marker','*');
hold on;

G=[2  -3  5 -3  3  1];
P=[46 23 45 79 23 12];

[x,y] = meshgrid(G,P);
z = 0*x + 2;
surf(x,y,z,'Marker','*');
hold on;

G=[2  2  -3 2  3  -1];
P=[36 45 23 54 56 23];

[x,y] = meshgrid(G,P);
z = 0*x + 3;
surf(x,y,z,'Marker','*');
hold on;

G=[1  -4  -4 -3  3  2];
P=[36 37 14 54 56 56];

[x,y] = meshgrid(G,P);
z = 0*x + 4;
surf(x,y,z,'Marker','*');
hold off;

The figure obtained is as follows:

You can read more about MESHGRID at the following documentation: http://www.mathworks.com/help/matlab/ref/meshgrid.html