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BUILT-IN MATHEMATICA SYMBOL
TraceScan
TraceScan[f, expr]
applies f to all expressions used in the evaluation of expr.
TraceScan[f, expr, form]
includes only those expressions which match form.
TraceScan[f, expr, s]
includes all evaluations which use transformation rules associated with the symbol s.
TraceScan[f, expr, form, fp]
applies f before evaluation and fp after evaluation to expressions used in the evaluation of expr.
Examplesopen all
Basic Examples (3)
Print all expressions used for evaluation:
Count additions and multiplications of machine numbers needed for a numerical computation:
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A recursive definition for finding Fibonacci numbers:
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Redefine 
so that it saves results:
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The second time through it takes only one call since the value was saved:
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New in 2
