.. _accessNodechains:

==============
**Nodechains**
==============

.. role:: red

Functions to access the attributes of node chains.

+------------+--------------+---------+-+++++++++++-----+------------------------------------------------------+
| Name       | Number of values | Unit | Access get/set | Description                                          |
+------------+--------------+---------+-+++++++++++-----+------------------------------------------------------+
| valid      | 1            | -       | g               | Gültigkeit (0 = ungültiger Knoten)                   |
+------------+--------------+---------+-+++++++++++-----+------------------------------------------------------+
| key        | 1            | -       | g               | Nummer des Knotens                                   |
+------------+--------------+---------+-+++++++++++-----+------------------------------------------------------+
| elkeys     | [N]          | -       | g               | Nummern aller angrenzenden N Elemente des Knotens    |
+------------+--------------+---------+-+++++++++++-----+------------------------------------------------------+

.. admonition:: Command:   	get_ndch_keys 	(      *"var"* 	 ) 
	
 Returns the ids of all node chains.

 **Parameter**
  | [out] :red:`var`	Identifier of Array holding the node chains

 **Example**
 ::
   
   num_ndchn = get_ndch_keys("ndchkeys")

   for i = 1, num_ndchn do
       nod_1,nod_2,nod_mid = get_nd_ndch_keys(i) 
       print(nod_1,nod_2,nod_mid)
   end