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I'd like to know how to plot a piece of a spherical shell $0.118<r<0.236$, $0<\theta<\pi$, $0<\phi<\pi/2$ by using the website Wolfram Alpha.

Gennaro Arguzzi
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  • Since you want to draw a sphere, the radius should be fixed. if we fix r=0.2, you can try "parametric plot3d {r sin(theta) cos(phi), r sin(theta) sin(phi), r cos(theta)} for r=0.2, theta=0 to pi, phi=0 to pi/2". – Always Oct 22 '23 at 13:28
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    To @Always: A spherical shell is the region between two concentric spheres of different radiuses. – Anton Vrdoljak Oct 22 '23 at 13:31
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    Is WolframAlpha mandatory for plotting? There are some nice examples of a spherical shell draws made by TikZ. For an instance, you may check this post – Anton Vrdoljak Oct 22 '23 at 13:36
  • Hello @AntonVrdoljak yes I'd like to know how to do that in Wolfram Alpha. – Gennaro Arguzzi Oct 22 '23 at 14:30
  • WA doesn't seem to have support for this functionality yet, but the underlying framework (Mathematica) does. You can supposedly sign up for free access to browser version of M here, though I'm not sure how much functionality free users have access to. At any rate, M can do it with built-in functions like ParametricRegion or RegionPlot3D – user170231 Feb 22 '24 at 21:15
  • Here's a link to a public notebook with a sample input and plot (you may or may not be able to click and drag on the plot to rotate the region) : https://www.wolframcloud.com/obj/c099d788-a1dc-49b4-862f-978980afbf8c – user170231 Feb 22 '24 at 21:28

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