# Class 41: Analyzing Procedures

Back to On Design. On to Analyzing Procedures, Continued.

This outline is also available in PDF.

Held: Monday, April 19, 2010

Summary: We consider techniques for analyzing the number of calls made in evaluating procedures, particularly recursive procedures.

Related Pages:

Notes:

• I'll reserve a few minutes at the start of class to go over the latest homework assignment.
• We seem to have a number of ill students today. Please take extra precautions this week.
• We'll also talk about the project proposals a bit today.

Overview:

• Comparing algorithms.
• Two related metrics: Time and Number of steps.
• Counting procedure calls by printing.
• Tools for analysis.

## Overview

• When comparing algorithms, we often care which one is faster.
• We can analyze by hand.
• We can analyze by using a library written at Grinnell.
• We can carefully study the code and predict (covered in future CS courses)

## Steps in Automating Analysis

• Replace `define` with `define\$`.
• Type `(analyze exp procedure)`
• Alternately, type `(analyze exp)`.

## Lab

Back to On Design. On to Analyzing Procedures, Continued.

Disclaimer: I usually create these pages on the fly, which means that I rarely proofread them and they may contain bad grammar and incorrect details. It also means that I tend to update them regularly (see the history for more details). Feel free to contact me with any suggestions for changes.

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The source to the document was last modified on Thu Jan 21 13:05:16 2010.
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Samuel A. Rebelsky, rebelsky@grinnell.edu

Copyright © 2007-10 Janet Davis, Matthew Kluber, Samuel A. Rebelsky, and Jerod Weinman. (Selected materials copyright by John David Stone and Henry Walker and used by permission.) This material is based upon work partially supported by the National Science Foundation under Grant No. CCLI-0633090. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. To view a copy of this license, visit `http://creativecommons.org/licenses/by-nc/2.5/` or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.