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A grid-function is a function living in a finite element space. Definition:

define gridfunction <name> <flaglist>
define gridfunction u -fespace=v

The string-flag fespace defines the fespace the grid function lives in. The flag must refer to a valid fespace.

If the define flag nested is specified, the grid-function will be prolongated from the coarse space to the fine space when the mesh is refined.

Joachim Schoeberl 2002-07-15