.. _eltset :

&nbsp_place_holder;

> **_ELTSET_**

>

>> This command creates eltsets or element sets with membership criteria:

>>

>>   1. **eq**:equal to, gt:greater than, **lt**:less than, **ge**: greater
than or equal, **le**: less than or equal to, **ne**: no equal to value of an
element attribute

>>   2. **inclusive** pset membership - all elements any of whose nodes is in
pset

>>   3. **exclusive** pset membership - all elements all of whose nodes are in
pset

>>   4. **face** pset membership - elements if all nodes of a face are in pset

>>   5. **union, inter, not**, boolian comparison with other eltsets

>>   6. **region** or **mregion** membership

>>   7. quality criteria (**volume** or **aspect** ratio)

>>   8. **list** - list element set members to screen, or list the names of
element sets if no 'eltset_name' is specified.

>>   9. **write** - write element set members to a file

>>   10. **delete** - remove element set from mesh object

>> The **mregion **and **region** form of this command calculate the center of
mass of the element and determine which mregion or region the center lies in.
It is possible if the interface surfaces are curved that the center will not
lie in the same mregion or region as the vertices. Using itetclr will give the
better result.

>

> FORMAT:

>

>> **eltset**/eset_name/element_attribute_name/**eq**|**ne**|**lt**|**gt**|**l
e**|**ge**/value/

**eltset/**eset_nam**e****/union|inter|not|delete/**eset_list/   
**eltset/**eset_name**/****inclusive|exclusive|face/pset/get/**pset_name/   
**eltset/**eset_name**/region|mregion/**region_name**|**mregion_name**/**   
**eltset**/eset_name /**volume/ eq|ne|lt|gt|le|ge** /value   
**eltset**/eset_name /**aspect/ eq|ne|lt|gt|le|ge** /value  
**eltset**/eset_name /**list**   
**eltset**/eset_name /**write**/file_name[.cellset]/[**ascii**|**binary**]   
**eltset**/-all- /**write**/file_name[.cellset]/[**ascii**|**binary**] 
>

> EXAMPLES:

>

>> **eltset/**element_set1/**itetclr**/**eq**/4

**eltset/**element_set2/**face**/**pset**/**get**/mypset  
**eltset/**element_set3/**inclusive**/**pset**/**get**/mypset  
**eltset**/element_set4/**region**/upper   
**eltset**/element_set5/**volume**/**lt**/3.0   
**eltset**/element_set5/**delete**  
**eltset** / /**list **(list the names of element sets which have been defined)