Errata

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Errata for Fall 2008 version

This is a list of errors or clarifications for the book Learning Computing With Robots. Feel free to add to this list. Please indicate the error/issue/comment and the page number printed on the page (not the page number in the PDF).

Corrected image of Gamdpad Controller Buttons (Button 3 and 4 are switched in the text.
Enlarge
Corrected image of Gamdpad Controller Buttons (Button 3 and 4 are switched in the text.
Pages 14, 114
Please replace the Gamepad Controller image with the one shown here on the right. You can click on the image to get a larger, full-page printable version to keep. or you can [click here] for an image the same size as in the text (almost) so it can be cut and pasted in the text.
Page 15
In 4. Explore a little further: Fix font of SPEED in SPEED can be.
Page 26
line 3: replace backwards(1) by backward(1).
Page 27
def yoyo(): There should be a call to stop() after the two statements in the function definition
Page 29
def yoyo(): There should not be a call to stop() in the definition (see correction for page 27 above)
Page 68
Exercises restart numbering back at 1 (rather than continuing with 6).
Page 74
line 5 of last paragraph: replace tranalate(1.0) by translate(1.0).
Page 77
on line 2 of second paragraph: replace randrange by randint.
Page 81
last code example on this page should read: 
forward(1.0)
wait(3.0)
stop()
Page 82
Add the stop() command at the end of first two examples on this page: 
while timeRemaining(3.0):
    forward(1.0)
stop()

Also, 

startTime = currentTime()
while (currentTime - startTime) < 3.0:
    forward(1.0)
stop()
Page 92
replace dfinition of randrange by that of randint. Also fix the paragraph spacing in the definition of random just above.
Page 94
moth will have should be month will have.
Page 114
See correction for Page 14 above.
Page 116
last line of section: replace See Exercise YY by See Exercise 6.
Page 147
In the code, the comment after turnSpeed wraps onto the next line
Page 190
In a graphics window with width, W and height H (i.e WxH pixels) the pixel

(0, 0) is at the top _left_ corner and the pixel (199, 299) will be at the bottom right corner. That is, x-coordinates increase as you go right and y-coordinates increase as you go left.

Pages 210-211
Add definitions of getP1 and getP2. These return the end points (Point object) of the Line object.
Page 213
Fix the font of all the beep examples.
Pages 238-239
Add definition of getBlob in Myro Review.
Page 246
Fix page number in footer to appear on the left corner.
Page 251
Description on how to play Tic Tac Toe is missing. For now see here.
Page 256
first line of text on the page: replace write a two more by write two more.
Page 266
The following sentence in the largest paragraph on this page:

"Since the relationship between the choices is cyclical the strategy can be implemented by picking the thing that beats the opponent’s pervious move beats."
should read:
"Since the relationship between the choices is cyclical the strategy can be implemented by picking the thing that beats the opponent’s pervious move."

Page 270
last line of Exercise 2 has a typo: "pr0ogram" should be "program".
Page 303
Italicize the font of polynomial time on last line of second bullet item.
Page 303
line 3 of first paragraph: replace speed on the by speed of the.
Page 304
line 1 of third paragraph: replace vocabulary of by vocabulary for.
Page 304
line 7 of third paragraph: replace in a an equivalence class by in an equivalence class.
Page 318
Last three lines of the second paragraph should be italicized: In the morning paper...Thanks!.
Page 324
Under Chapter 4 replace definition of randrange with randint.
Page 337
Fix font for definition of getPixel(<picture>, x, y).



Errata for June 2008 version

Thank you all for sending these corrections. We have incorporated these (and others) in the Fall 2008 version of the text.

This is a list of errors or clarifications for the book Learning Computing With Robots.

  1. p.228, Chapter 9: takePicture) should be takePicture() [missing paren]
  2. p. 64, Chapter 3: The link to American Scientist no longer works; the page seems to have been taken down.
  3. p. 50, Chapter 3: January spelled wrong in comments of program.
  4. p. 29, Chapter 2: backward, waitTime) should be backward(speed, waitTime)
  5. p. 92, Chapter 5: TakePicture(“gray”) should be takePicture("gray") [incorrect capitalization]
  6. p. 134, Chapter 6: 
  # decide how to act based on sensors values 
  if (L - R) > thresh: 
     # left is seeing less light than right so turn right 
     turnRight(1.0) 
  elif (L - R) < thresh: 
     # right is seeing less light than left, so turn left 
     turnLeft(1.0) 
  else: 
     # the difference is less than the threshold, stay put       
     stop() 

  Should the elif statement be elif (R-L)>thresh: or elif (L-R)<-thresh:?
  1. p. 158, Chapter 7: no periods in top paragraph
  2. p. 182, Chapter 8: In Main and in the pictured graphics window, "Cicrles" should read "Circles".
  3. p. 192, Chapter 8: The second tone is exactly one octave above middle C. should read The second tone is exactly one octave above the first. .
  4. p. 193, Chapter 8: C#4/Db4 = 261.63* 2^(1/2) = 277.18 should say 2^(1/12) instead of 2^(1/2), with the same correction for D#4/Eb4.
  5. p. 194, Chapter 8: The last note in the scales should be the C with the octave number increased by one. Also, the scales are chromatic (rather than major or minor).
  6. p. 179, Chapter 8: In the image on the page, the title of the Graphics Window should be "My Masterpiece".
  7. p. 201, Chapter 8: I do not understand exercise 5.
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