Help me about sphere ?
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I have this code to draw haft of sphere x^2 + y^2 + z^2 = 1, z>0. but it have error. help me to fix it. thanks very much.
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Answers (1)
Mischa Kim
on 27 May 2014
Edited: Mischa Kim
on 27 May 2014
Nguyen, use instead
z = real(sqrt(1 - x.^2 - y.^2));
to retain the real part only.
3 Comments
Mischa Kim
on 27 May 2014
Edited: Mischa Kim
on 27 May 2014
In a perfect world, yes. However, in numerical computations zero is not always (exactly) equal to zero. Check out this answer for reference. If you remove the semi-colon from
z = sqrt(1 - x.^2 - y.^2)
you'll notice that there are small non-zero imaginary parts.
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