Is the z-axis in a Sphere only positive?

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민제 강
민제 강 2022-9-5
评论： Chunru 2022-9-5
[X, Y, Z] = sphere(10);
Points = [X(:), Y(:), Z(:)].';
plot3(Points(1,:), Points(2,:), Points(3,:), 'x');
I want to get points by representing only the positive z-axis.

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Chunru
Chunru 2022-9-5
编辑：Chunru 2022-9-5
Ran in:
No. It consists of both positive and negative parts.
[X, Y, Z] = sphere(100);
Points = [X(:), Y(:), Z(:)].';
%plot3(Points(1,:), Points(2,:), Points(3,:), 'x');
surf(X, Y, Z)
whos
Name Size Bytes Class Attributes Points 3x10201 244824 double X 101x101 81608 double Y 101x101 81608 double Z 101x101 81608 double cmdout 1x33 66 char
figure
idx = 51:101;
surf(X(idx, :), Y(idx, :), Z(idx, :))

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