In-class notes for 04/28/2014

CS 121B (CS1), Spring 2014

• Homework assignment

• CS talk today at 3:30 in RNS 410:
  Carl Albing, one of the first students to take CS at St. Olaf in mid-70's, now at Cray Research.

• Next quiz on Wednesday

Submitted questions on assignments and technology

• Simulation questions, 1 c

  • Starting point: solution to 1 b

  • Modifying toward a solution to the changed problem

Project voting and selection

• Results

Upcoming

• Homework 30

• Quiz on Wednesday. See below for topics.

To study for quiz

• Subclasses; class variables; aggregation. See recent homework

  Examples: Account (spec, code);
  Account2 (spec, code);
  IntAccount (spec, code
  Garden (spec, code)

• WMR techniques: multipart keys and values; multi-case reducers and mappers

  Examples: compute mean movie rating and maximum date in same map-reduce cycle;
  compute frequency of individual words plus total number of words in entire corpus, using a single map-reduce cycle.

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