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.

See notes for Trace.

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.

See Section 2.6.11.

New in Version 2.