<note>TODO: More info required </note>

===== LagrangianMultiplierEdge[2|3]DElement =====

Mechanism element controlling an edge from the motion of a point. No axisymmetric correction is implemented. These elements must be associated with a ''[[#Edge monitoring using Lagrange multiplier|FieldApplicator]]'' interaction .
==== Parameter ====

^  Code Metafor  ^  Description  ^  Dependency  ^
| ''STIFFMETHOD'' | Method used to compute the stiffness matrix\\ = ''STIFF_ANALYTIC'' : analytic matrix (default)\\= ''STIFF_NUMERIC''  : numerical matrix             |  -  |
| ''CONST_POINT_NO'' | Point monitoring the motion of the edge |  -  |
| ''CONST_DIRECTION'' | Constraint direction (1, 2 or 3) |  -  |

===== Edge monitoring using Lagrange multiplier =====

The element must first be created using [[doc:user:geometry:mesh:1D]]. Then, a ''FieldApplicator'' is defined and associated to a [[doc:user:elements:general:def_element_properties|ElementProperties]], either ''[[#lagrangianmultiplieredge_2_3_delement|LagrangianMultiplier2DEdge]]'' or ''[[#lagrangianmultiplieredge_2_3_delement|LagrangianMultiplier3DEdge]]''.

  app = FieldApplicator(no)
  app.push(gObject1)
  app.push(gObject2)
  ...
  app.addProperty(prp)        # association of an ElementProperties
  interactionset.add(app)     # the interaction is added in InteractionSet 

or

  app = interactionset.add(FieldApplicator(no)) #add returns a reference
  app.push(gObject1)
  app.push(gObject2)
  ...
  app.addProperty(prp)        # association of an ElementProperties

where 
| ''no''  | number of the ''Interaction'' (which is to say the ''FieldApplicator'') | 
|''gObject1'', ''gObject2''  | meshed geometric entity where the finite elements are applied |
| ''prp'' | [[doc:user:elements:general:def_element_properties|Properties]] of the [[#lagrangianmultiplieredge_2_3_delement|Lagrange multipliers]] to generate.|