TraceScan
 Usage
• 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.
Notes
• All expressions are wrapped in HoldForm to prevent evaluation before f or fp are applied to them. • The function fp is given as arguments both the form before evaluation and the form after evaluation. • TraceScan[f, expr] returns the result of evaluating expr. • New in Version 2.
| 
