TraceAbove

TraceAbove

is an option for Trace and related functions which specifies whether to include evaluation chains which contain the evaluation chain containing the pattern form sought.

Details

  • TraceAbove->True includes the first and last expressions in all evaluation chains within which the evaluation chain containing form occurs.
  • TraceAbove->All includes all expressions in these evaluation chains.
  • TraceAbove->{backward,forward} allows you to specify separately which expressions to include in the backward and forward directions.
  • Using TraceAbove, you can see the complete paths by which expressions matching form arose during an evaluation.

Examples

Basic Examples  (1)

A recursive definition for finding Fibonacci numbers:

Show only what sums of fib are encountered:

Show the beginning of the evaluation chain that leads to each sum of fib :

Show the entire evaluation chain that leads to each sum of fib:

Introduced in 1991
 (2.0)