fix_modify AtC fix <field> <nodeset> <constant | function>
 fix_modify AtC fix temperature groupNAME 10.  
  fix_modify AtC fix temperature groupNAME 0 0 0 10.0 0 0 1.0  
 
Creates a constraint on the values of the specified field at specified nodes.
keyword 'all' reserved in nodeset name
none
 1.6.1
 1.6.1