6.001 Fall 98: Current announcements

Sunday, Dec. 20

The semester is over! See Final exam results.

Friday, Dec. 11

An optional Q&A LA session will be held on Sunday, Dec 13, from 7-9pm in 54-100.

Thursday, Dec. 3 -- Final Exam Announcement

The Final Exam Announcement is available, as well as a sample final (ps| pdf| solutions-ps| solutions-pdf).

Tuesday, Nov. 24 -- Problem Set 9: Even?

You may add and use even? as a primitive if you find it helpful.

Monday, Nov. 16 -- Problem Set 8 Loading and Lab Exercise 2

Probsets.scm file modified so that lex-dyn.scm file is not automatically loaded. This file is only for the last problem on the problem set.
For Lab Exercise 2, it is sufficient to implement a two argument AND, e.g. (and expression1 expression2)

Saturday, Nov. 14 -- Additional Notes on Dynamic Scoping (PS8)

Additional notes are available discussing the addition of dynamic scoping to Scheme. These may be helpful as you explore this issue on Problem Set 8.

Special note on Dynamic Scoping: dynamic-notes.ps | dynamic-notes.pdf | dynamic-notes in html
Dynamic & lexical scoping environment diagram: dynamic.ps | dynamic.pdf

Monday, Nov. 9 -- Problem Set 7 Handout

A section was omitted on page 2 of the problem set handout given out in lecture. The problem set handout on the web has been updated to include this missing section. (The pdf file has also been updated to include the missing section).

Quiz 2, Nov 6

Statistics on quiz 2: average is 74.65, standard deviation is 15.6.
Quiz 2 Solutions: postscript | pdf

Wednesday, Oct 28 -- Problem Set 6, Tutorial Exercise 2

The last two lines of the code are fixed below:

(define (make-df-strategy-2 goal? neighbors)
  (define (where-next? here)
    (let ((*to-be-visited* '()))         ; Nodes to look at
      (set! *to-be-visited*              ; Add on new nodes
            (append (neighbors here) *to-be-visited*))
      (cond ((goal? here) #T)            ;  We win!
            ((null? *to-be-visited*) #F) ; Nowhere left to look
            (else                        ; Visit next node
             (let ((next (car *to-be-visited*)))
               (set! *to-be-visited* (cdr *to-be-visited*))
               next)))))
  where-next?)

Tuesday, Oct 27

Problem Set 7 Distribution
Problem set 7 will be distributed in lecture on Thursday instead of today (in case you thought you missed the handout).
Quiz 2 announcement and information.

Monday, Oct 26 -- Exam 1 Regrades Finished

After incorporating the regrades, the new stats on quiz 1: average 73.71, standard deviation is 15.89. No more regrades will be accepted.

Thursday, Oct 22 -- Lab LA Staffing Hours

There have been some changes in the LA lab staffing hours during the weekends.

Monday, Oct 19 -- Problem Set 5, Problem 9

Since the cotangent function is infinite at x=0, and you can't use div-series because the constant term for sin x is zero, generate a series for (x cot x) instead of (cot x).

Tuesday, Oct. 13 -- Problem Set 4 tar/zip files

If you have trouble loading the problem set code, you should be sure to download the revised tar/zip files from the home page. A bug in the probsets.scm file was corrected to fix an unpack/loading problem. The tar/zip files should be correct as of Saturday (Oct. 10) 4:30 pm, so if you downloaded after that (or are just working in the lab) you should have no problem.

Quiz 1 Solutions, Oct. 9

Statistics on quiz 1: average is 73.5, standard deviation is 15.8. These correspond roughly to grades as follows: 90-100 A; 73-89 B; 58-72 C; 57 and below D/F.

Sunday, Oct. 4 -- Quiz 1 Review Sessions

Please note that the 5-7 PM Sunday review session is Cancelled. The Lab Assistants will hold two sessions:
- Sunday, Oct. 4, 7:00 - 9:00 PM -- Room 4-270
- Monday, Oct. 5, 7:00 - 9:00 PM -- Room 4-270

Thursday, Oct. 1 -- Quiz 1 Info

Additional details about Quiz 1 are available.

Sunday, Sept. 27 -- Images for Problem Set 3

Images for the problem set were not bundled with the problem set distribution on the web because they are included with the Scheme distribution. They will automatically load when you use pgm-file->painter. To see what pgm files are available, on a PC, you can look in: c:\mitscheme\lib\6001\images.

Thursday, Sept. 24 -- Bug Fixes to Problem Set 2 Code:

You should change and evaluate the following corrected definition for the bid-shares accessor in the problem set code:

  (define (bid-shares bid) (cdr bid)) ; Corrected to get cdr of BID
; (define (bid-shares bid) (cdr ask)) -- Error as shown in PS code

Wednesday, Sept. 23

If you have questions or need help, one of the ways to get help is to email 6001-help@mit.edu

Sunday, Sept. 20 -- Errata to Problem Set 2:

The problem set text shows some sample data for ibm-previous-close and ibm-prices that does not match with the data actually provided in the Scheme code. The problem set text in Section 2 (on page 3) should read:
```
(define ibm-previous-close 100.0)
(define ibm-prices (list 100.5 101.0))
```
and the example computations on this data shown in computer exercises 1 and 3 should be:
```
(price-trend ibm-previous-close ibm-prices)
==> 1.0

(price-high ibm-prices)
==> 101.
```
The later exercises in the problem set text use the correct (and very short!) ibm data.

The example result in computer exercise 18 should be:

(parallel-scale 0.5 NeoWidget-hours)
;Value: .7142  ; this is 5/7 NOT 4.5/7 as given in pset handout

Wednesday, Sept. 9

Some important information distributed in recitations:
- 6.001 General information handout. (Also available in postscript or pdf versions.)
- Don't Panic guide. (Also available in postscript or pdf versions.)
- Problem Set 0
- Recitation sign-up sheets. If you missed this, you will have the opportunity to fill this out in lecture on Thursday to get assigned to your permanent recitation.
Addendum to Problem Set 0: Edition 1.1 of the "Don't Panic" manual was handed out in recitation. However, you will need to consult the more recent "Don't Panic Edition 1.2" available on the web to answer questions for Problem Set 0.

Tuesday, Sept. 8

Make sure you obtain and fill out a recitation sign-up form.
These will be given out at all all recitations on the first day of class on Wednesday, September 9. For this first recitation (Sept. 9) only, you can attend the recitation time the registrar assigned you to, or any other available 6.001 recitation. It is essential that you attend and hand in the recitation sign-up form, or return the completed form to 39-567 before noon September 10. This is required in order to assign you to a permanent 6.001 recitation section.

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