I got a question regarding the meaning of the “args” of keywords “pos” and “vel” in “fix wall/piston command?” The doc says that
*"pos* args = z z = z coordinate at which the piston begins (distance units) *vel* args = vz vz = final velocity of the piston (velocity units)"
which seems: pos needs only one argument z, and vel needs only one argument vz (the z component of the piston). But in the Example part of the doc: fix walls all wall/piston zlo pos 1.0 0.0 0.0 vel 0.0 0.0 10.0 units box There are three args for each keyword, what is the meaning of those three values?
Thank you very much, Lili