Plotting a 3D line on a surface plot

Question

DONGUK KIM 2020-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/531288-plotting-a-3d-line-on-a-surface-plot

回答： Apurvi Mansinghka 2020-6-18

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I want to plot a 3D line

y = A.*((1+(9/4).*x).^(3/2)-1);

z = x.^(3/2);

on the surface

z = x.^(3/2);

so basically I want two plots one surface and other a line.

Here's the code that I wrote that doesn't return the result that I was looking for.

[X,Y] = meshgrid(0:0.1:30,1:30);
Z = X.^(3/2);
A = 8./(13.^(3./2)-8);
x = linspace(0,30,100);
y = A.*((1+(9/4).*x).^(3/2)-1);
z = x.^(3/2);
hold on 
plot3(x,y,z)
surf(X,Y,Z)
hold off

When I run this it returns a 2D plot of a line and some random pixels.

Is there a way to make this code work?

Thanks.

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Walter Roberson 2020-5-23

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view(3)

When hold is on, view(3) is not automatically called for 3d graphics.

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Answer 1

Apurvi Mansinghka 2020-6-18

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/531288-plotting-a-3d-line-on-a-surface-plot#answer_453312

在 MATLAB Online 中打开

Hi,

I understand you want to plot multiple 3D objects on the same plot. In order to do so use the function view(dim) to specify line of sight for 3-D plots.

Modify the code as follows:

[X,Y] = meshgrid(0:0.1:30,1:30); 
Z = X.^(3/2); 
A = 8./(13.^(3./2)-8); 
x = linspace(0,30,100); 
y = A.*((1+(9/4).*x).^(3/2)-1); 
z = x.^(3/2); 
view(3) % set dim=3 for 3-D plot 
hold on 
plot3(x,y,z) 
surf(X,Y,Z) 
hold off 