booleanFilter class inherits class expressionFilter and exists for the purpose of methods dispatching.booleanFilter is a constructor from an expression
char2booleanFilter is a constructor from a character string
booleanFilter(expr, ..., filterId = "defaultBooleanFilter")
char2booleanFilter(expr, ..., filterId = "defaultBooleanFilter")
"show"(object)expression or charactercharacter identifierbooleanFilteradd GatingHierarchy