This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


is an option for various numerical computation and plotting functions that gives an expression to evaluate whenever functions derived from the input are evaluated numerically.
  • The option setting is normally given as EvaluationMonitor:>expr. The :> is used instead of -> to avoid expr being immediately evaluated.
  • Whenever expr is evaluated, all variables in the numerical computation are assigned their current values. Block[{var1=val1, ...}, expr] is effectively used.  »
New in 5 | Last modified in 6