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:

Wolfram Research (1991), TraceAbove, Wolfram Language function, https://reference.wolfram.com/language/ref/TraceAbove.html.

Text

Wolfram Research (1991), TraceAbove, Wolfram Language function, https://reference.wolfram.com/language/ref/TraceAbove.html.

BibTeX

@misc{reference.wolfram_2021_traceabove, author="Wolfram Research", title="{TraceAbove}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/TraceAbove.html}", note=[Accessed: 31-July-2021 ]}

BibLaTeX

@online{reference.wolfram_2021_traceabove, organization={Wolfram Research}, title={TraceAbove}, year={1991}, url={https://reference.wolfram.com/language/ref/TraceAbove.html}, note=[Accessed: 31-July-2021 ]}

CMS

Wolfram Language. 1991. "TraceAbove." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TraceAbove.html.

APA

Wolfram Language. (1991). TraceAbove. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TraceAbove.html