\hide

Description 

Operator \hide is the dual of \show.
Operator \hide allows to hide previously drawn graphical elements. Elements given by the operator can be an edge or a list of vertices. If an edge is given to hide, the system checks that this edge had been defined (edges are defined by folds definition cf. §). If vertices are given, the system hides all edges containing any of them.
This operator should only appear within a step block.

Usage

  \hide([a, b]);    % hide the existing edge between a and b
  \hide(c);         % hide all edges containing c
  \hide(c, d, ab2); % hide all edges containing c, d or ab2

Formal structure

  \hide(EDGE);
  \hide(VERTICES_LIST);

Parameters

  EDGE
  Description    : Indicates an explicit edge to hide.
  Type           : Edge, couple of vertex identifiers.
  Allowed values : Any couple of vertex identifiers already 
                   defined in a previous step.
  VERTICES_LIST  : Vertices to hide. In fact, hide all edges that
                   contain those vertices.
  Type           : List of vertex symbols.
  Allowed values : Any sequence of vertex identifiers already 
                   defined in previous steps.