Creating a contour plot of magnitude in 3D

I want to create a 3D contour plot from a matrix which has 4 columns like this example below (example is simplified version of my data)

X Y Z Mag

0 0 0 15

1 0 0.5 4

0 1 0.5 13

1 1 1 20

I want to plot this in as a surface in a 3D (x,y,z) plane with a contour over the surface defined by the magnitude. How would I go about this?

Answer 1

[G A]

Something like this?

a=-1:0.1:1;
b=-1:0.1:1;
[X,Y]=meshgrid(a,b);
Z=X.^2+Y.^2;
M=[0.5 1];
hold on 
grid on
surf(X,Y,Z),
shading interp,
view(3),
[~,c]=contour3(X,Y,Z,M);
c.LineWidth=5;
c.LineColor='g';