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TraceForward
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TraceForward

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is an option for Trace and related functions which specifies whether to include later expressions on the evaluation chain that contains the pattern form sought.

Details

  • TraceForward->True includes the final expression on the evaluation chain that contains form.
  • TraceForward->All includes all expressions after form on the evaluation chain that contains form.
  • TraceForward allows you to see the transformations performed on an expression generated during an evaluation.

Examples

Basic Examples  (1)Summary of the most common use cases

A recursive definition for finding Fibonacci numbers:

In[1]:=1
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https://wolfram.com/xid/0i1mmgdmi-bjc302

Show only what evaluations of fib are encountered:

In[2]:=2
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https://wolfram.com/xid/0i1mmgdmi-go0q0y
Out[2]=2

Show only the evaluations of fib and the results:

In[3]:=3
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https://wolfram.com/xid/0i1mmgdmi-f05ioc
Out[3]=3

Show all intermediate evaluations between calls of fib and the result:

In[4]:=4
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https://wolfram.com/xid/0i1mmgdmi-rmx17
Out[4]=4
Wolfram Research (1991), TraceForward, Wolfram Language function, https://reference.wolfram.com/language/ref/TraceForward.html.
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Wolfram Research (1991), TraceForward, Wolfram Language function, https://reference.wolfram.com/language/ref/TraceForward.html.

Text

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

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

CMS

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

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

APA

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

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

BibTeX

@misc{reference.wolfram_2025_traceforward, author="Wolfram Research", title="{TraceForward}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/TraceForward.html}", note=[Accessed: 01-May-2025 ]}

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@misc{reference.wolfram_2025_traceforward, author="Wolfram Research", title="{TraceForward}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/TraceForward.html}", note=[Accessed: 01-May-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_traceforward, organization={Wolfram Research}, title={TraceForward}, year={1991}, url={https://reference.wolfram.com/language/ref/TraceForward.html}, note=[Accessed: 01-May-2025 ]}

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@online{reference.wolfram_2025_traceforward, organization={Wolfram Research}, title={TraceForward}, year={1991}, url={https://reference.wolfram.com/language/ref/TraceForward.html}, note=[Accessed: 01-May-2025 ]}