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grpa

       'grpa' <groupNr> <set>

This keyword is used to append elements from a set to a group. In the post processor mode sets are not usable. To display only elements of a specific set in the post processor mode the elements stored in the set must be assigned to a group. The group is an numeric attribute to the each element of the mesh and will be stored with the mesh if the frd-format is used (see send). For example
grpa 7 part
assigns the number 7 to all elements in the set part. Elements can have just one number. Therefore one element can not be a member of more than one group. The default group is 0. This numbers will be saved with the mesh if the database is written to the file-system with the command:
send all frd
If this file is used later the groups are available from the beginning.
In combination with the command ``group auto'' this numbers will be erased and automatic numbering is used. This mode is the default and in this case you might read a set of elements either in frd, abq or fbd format and store this information in a set. For example:
read ring.frd ring
will assign all elements and nodes specified in the file ring.frd in the set ring. All this elements and nodes must be already defined before you read the file because with this method no definition of a mesh is possible. Then display the elements in the set with the command:
plot e ring l
and this elements are now the actual group. You can now continue to evaluate results (if any) by choosing a dataset and an entity. Then you see results only on the elements included in the set ring.

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