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A name may be associated with a coordinate point by the construct

 

point_name = POINT(a,b)

 

Here a and b must be computable constants at the time the definition is made.  They may not depend on variables or coordinates.  They may depend on stage number.

 

The name of the point can subsequently appear in any context in which the literal point (a,b) could appear.

 

Individual coordinates of a named point can be extracted using vector component operators.

 

Movable Points

 
The qualifier MOVABLE can be used with named points that are used in boundary definitions in moving-mesh problems. These points become locked to the mesh, and will move as the mesh moves.

Such points can be used in "AT" selectors for histories to track values at points that move with the mesh.

 

Examples:

Samples | Usage | Moving_Mesh | 2D_Movepoint.pde