FilterRules

FilterRules[rules,patt]
filters the list rules by picking out only those rules whose left-hand sides match patt.

FilterRules[rules,{patt1,patt2,}]
picks out rules whose left-hand sides match any of the .

DetailsDetails

  • The rules in the list rules can be either or rules.
  • If any of the is a rule of the form , then it is treated the same as lhs.
  • If is a string, it will also match a symbol whose name is the string.
  • FilterRules[rules,Except[patt]] gives all rules except those whose left-hand sides match patt.
Introduced in 2007
(6.0)