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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.
  • 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.
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:
A recursive definition for finding Fibonacci numbers:
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Click for copyable input
Show only what sums of fib are encountered:
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Show the beginning of the evaluation chain that leads to each sum of fib :
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Click for copyable input
Out[3]=
Show the entire evaluation chain that leads to each sum of fib:
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