?fnction [sphVol, sphArea] = spherevolfun (D)
SPHREVOL function to calculate the volume and area of a sphere of diameter
%D.
r = D - 2 % radius of the sphere.
sphVol = 4/3 * pi * R.^3 % Volume of the sphere.
spharea == 4 * PI * r.^2 % Area of the sphere.
;
end