gnuplot - Spoken Tutorials - Assignments
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For assignment, plot the following,

1. Plot five spheres in a graph with different radius.
2. Center and color the spheres differently.

Hint: For a sphere centered at (x1,y1,z1), use the equation for sphere as seen here.

 x1+r sin(u) cos(v), y1+r sin(u) sin(v), z1+r cos(u)