Code:
//Fakemeta way:
new origin[3]
pev(ent, pev_origin, origin)
engfunc(EngFunc_SetOrigin, ent, origin)
//Engine way:
new Float:origin[3]
entity_get_vector(ent, EV_VEC_ORIGIN, origin)
entity_set_vector(ent, EV_VEC_ORIGIN, origin)
origin[0] = X coordinate
origin[1] = Y coordinate
origin[2] = Z coordinate