How to move the axes so that they start from the center of the sphere (0,0,0)

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Atom 2022-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738515-how-to-move-the-axes-so-that-they-start-from-the-center-of-the-sphere-0-0-0

评论： Atom 2022-6-12

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()1 How to move the axes so that they start from the center of the sphere (0,0,0)

(2) If I only want to keep the boundary curve and remove the interiors, what to do?

R = 1 ;

theta = linspace(0,2*pi) ;

phi = linspace(0,pi) ;

[T,P] = meshgrid(theta,phi) ;

X1 = R*cos(T).*sin(P) ;

Y1 = R*sin(T).*sin(P) ;

Z1 = R*cos(P) ;

zlim([0,5])

surf(X1,Y1,Z1,'EdgeColor','r', 'FaceColor', 'none', 'FaceAlpha', .5) ;

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Image Analyst 2022-6-12

I guess he wants just the convex hull points, like from convhulln

Atom 2022-6-12

The interior is like as the post of Image Analyst (convhulln)

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Answer 1

Star Strider 2022-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/1738515-how-to-move-the-axes-so-that-they-start-from-the-center-of-the-sphere-0-0-0#answer_983695

在 MATLAB Online 中打开

Try something like this —

R = 1 ;

theta = linspace(0,2*pi) ;

phi = linspace(0,pi) ;

[T,P] = meshgrid(theta,phi) ;

X1 = R*cos(T).*sin(P) ;

Y1 = R*sin(T).*sin(P) ;

Z1 = R*cos(P) ;

zlim([0,5])

surf(X1,Y1,Z1,'EdgeColor','r', 'FaceColor', 'none', 'FaceAlpha', .5, 'EdgeAlpha',0.5) ;

hold on

plot3([0 0],[0 0],zlim, '-k', 'LineWidth',1.5)

xline(0, '-k', 'LineWidth',1.5)

yline(0, '-k', 'LineWidth',1.5)

Ax = gca;

xt = Ax.XTick;

yt = Ax.YTick;

zt = Ax.ZTick;

Ax.Visible = 'off';

plot3([xt; xt], ones(2,numel(xt)).*[-1;1]*0.1, zeros(2,numel(xt)), '-k')

plot3(ones(2,numel(xt)).*[-1;1]*0.1, [yt; yt], zeros(2,numel(xt)), '-k')

plot3(ones(2,numel(xt)).*[-1;1]*0.1, zeros(2,numel(xt)), [zt; zt], '-k')

hold off

text(xt, zeros(size(xt)), zeros(size(xt)), compose(' %.1g',xt), 'Horiz','left', 'Vert','middle', 'Rotation',-35)

text(zeros(size(yt)), yt, zeros(size(yt)), compose(' %.1g',yt), 'Horiz','left', 'Vert','middle', 'Rotation',30)

text(zeros(size(zt)), zeros(size(zt)), zt, compose(' %.1g',zt), 'Horiz','left', 'Vert','middle', 'Rotation',-10)

axis('equal')

.

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Answer 2

Image Analyst 2022-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/1738515-how-to-move-the-axes-so-that-they-start-from-the-center-of-the-sphere-0-0-0#answer_983685

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The usual way is

ax = gca;
ax.XAxisLocation = "origin";
ax.YAxisLocation = "origin";

However it doesn't seem to work for this 3-D plot. Not sure why. It does work for 2-D plots though.

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Atom 2022-6-11

编辑：Atom 2022-6-11

No..it is not working

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