P

-

the name of the point

Px

-

the x-coordinate

Py

-

the y-coordinate

Pz

-

the z-coordinate

form(P)

returns the form of the geometric

object (i.e., point3d if P is a point).

coordinates(P)

returns [Px,Py,Pz].

xcoord(P)

returns Px which is the x-coordinate

of P.

ycoord(P)

returns Py which is the y-coordinate

of P.

zcoord(P)

returns Pz which is the z-coordinate

of P.

detail(P)

returns a detailed expression of the

point P.