This is documentation for Mathematica 3, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)
 Documentation / Mathematica / Built-in Functions / Programming / Assignments  /
UpSet

  • lhs ^= rhs assigns rhs to be the value of lhs, and associates the assignment with symbols that occur at level one in lhs.
  • f [ g [ x ]]= value makes an assignment associated with f. f [ g [ x ]]^= value makes an assignment associated instead with g.
  • UpSet associates an assignment with all the distinct symbols that occur either directly as arguments of lhs, or as the heads of arguments of lhs.
  • See the Mathematica book: Section 2.4.10Section A.5.2.
  • See also: TagSet, UpValues.