Using surf to represent a function with color.
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Hi everyone, I would like to represent the magnitude of a function on a surface (hemisphere) using a color map. Here is my current attempt
r=22; %radius of sphere
phi=linspace(0,pi,30);
theta=linspace(0,pi,40);
[phi,theta]=meshgrid(phi,theta); %meshgrid of sphere
x=r*sin(phi).*cos(theta);
y=r*sin(phi).*sin(theta);
z=r*cos(phi);
mesh(x,y,z)
hold on
theta = linspace(0,pi)
R=1/22 % R=Rs/r (constant)
Bo=21000 %constants
Bmag = Bo*((R).^3).*((1+3*(sin(theta)).^2)).^0.5 %magnetic field function
surf(x,y,z,Bmag)
I then get the error message
Warning: Error creating or updating Surface
Error in value of property CData
Array is wrong shape or size
Does anyone have any idea how I could represent this?
回答（1 个）
Walter Roberson
2015-12-22
0 个投票
Delete the theta = linspace(0,pi) that you are using to redefine theta.
2 个评论
John Draper
2015-12-22
Walter Roberson
2015-12-23
Remove the mesh()
The default for mesh is to color by z, so your color values for that range the same as your z, -22 to +22. Then when you surf() with Bmag as the color values (about 1.97 to twice that), MATLAB still has to use a color interpolation range large enough to include the now-hidden mesh, but only a narrow range of values are present in the visible image so they map to a narrow range of visible colors.
By default surf() draws edges, and so outlines the mesh anyhow. You can turn off those edges with
surf(x, y, z, Bmag, 'edgecolor', 'none')
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2015-12-22
2015-12-23
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