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Details:
Title: Mastering Dyalog APL: A Complete Introduction to Dyalog APL
Author: Bernard Legrand
ISBN-10: 0956463800
ISBN-13: 978-0956463807
No book is free of errors, and this we are sure is no exception. We have listed ones that we know about
in the following section; if you find a new item of interest, and would like to report it, then please
could you do so by sending an email to support@dyalog.com.
If you like the book (or even if you don't), please let us know too !
Errata as of 2012-01-17
Chapter |
Page |
Erratum_Type |
Comment
|
Intro |
3 |
typo |
Utilities and Data
"WorkSpace" should be "Workspace".
|
Intro |
3 |
suggestion |
Utilities and Data
DyalogTutor_EN should be in the index.
|
Intro |
4 |
typo |
Penultimate paragraph
"justifyable" should be "justifiable".
|
Intro |
10 |
suggestion |
2nd paragraph
Alter to read "..the other symbols (...) we have discussed so far are called.."
|
Intro |
16 |
typo |
First line
Remove extraneous "that" in first line.
|
Intro |
29 |
typo |
2nd bullet point, last line
Add "is" in "there __ no need .."
|
A |
36 |
typo |
1.3.1 end of 1st paragraph
Add "," in "in the same way as__ for .."
|
A |
46 |
suggestion |
End of 1.3
Clarity in the last paragraph:
It should be pointed out that clarity is an issue as well: with
a b←1 2
one cannot say what is going to happen. a and b may be variables holding a 1 and a 2,
but the expression might also create a variable b which holds 1 and 2 because a is a
monadic function that does not return an argument.
a←{}
a b←1 2
b
1 2
For that reason the () in the assignment statement are strongly recommended.
|
B |
51 |
debate |
3.2
"A single number has no dimensions" .. what about ⍴,1 ?
|
B |
56 |
typo |
Display of MonVec
There should be two spaces between "March" and "April", as between the other months.
|
B |
61 |
suggestion |
5.5.2
Quicker than Text[;1]←0 would be Text←(⍴Text)⍴0 and similarly for Vector.
|
B |
62 |
typo |
5.6
4 2 ⌷ Tests returns 40, not 78.
|
B |
65 |
suggestion |
penultimate paragraph
Suggest "but it will not be long before you understand immediately what it means."
|
B |
71 |
suggestion |
Remark
Consider adding a reference to G-1.1.5 or I.7 which explain the difference between
empty numeric and character vectors.
|
B |
71 |
typo |
Penultimate bullet point
"which is equivalent to ""Save As""".
|
B |
71 |
typo |
last bullet point
remove "," after "APL".
|
B |
75 |
typo |
8.4 First sentence
dws, which stands for Dyalog WorkSpace.
|
B |
87 |
suggestion |
SPE-6
Explain further the uses of Monadic Index.
|
B |
87 |
typo |
Penultimate paragraph
Extra "a" in the sentence "Applied to a an Enumerable .."
|
C |
96 |
typo |
Last paragraph of Warning!
Should read "why we recommend that you do all .." (remove "to").
|
C |
110 |
typo |
Row-wise multiplication
Second example should read "Tam×[1]5 2 7" - not 5 2 10
|
C |
121 |
typo |
12.1 Example
Font wrong in comment "We ask for the positions of 5"; "ask" and "the positions of" too big.
|
D |
152 |
content |
Sesction 2.1
The statement "The arguments ⍵ and ⍺ are read-only" is not precise. Assignment to ⍺
occurs if the dfn which contains the assignment is called monadically; it is the syntax used to define
an ambivalent dfn.
|
D |
156 |
content |
Section 3.2
This section is written with the assumption that the variable res, which was created when you
ran Meanval before adding res← to the function header, has been deleted. When you first
ran the function, since res did not appear in the header, it was created as a global variable.
You haven't been asked to delete it so far, so it still exists. To make this section more
understandable, type
)erase res
before trying the code !
|
D |
166 |
typo |
1/2 way down page
"all we need do is replace..". Add "to".
|
D |
171 |
content |
If condition 1
The comment to the right of "Block 1" should read: "Executed if Condition 1 is satisfied"
|
D |
181 |
typo |
First line of 4.6.1 and 4.6.2
"In any kind of loop" is in too-small a font.
|
D |
190 |
content |
Jump if true..
The expression
→Destination×⍳Condition
works only if ⎕io is 1.
|
D |
203 |
suggestion |
1/2 way down page
Should Prompt1[1] be ⎕←'What are the limits' ?
|
D |
204 |
suggestion |
Hint
Another alternative is to type →
|
D |
216 |
content |
At end of section
Note that with a dfn the assignment does not create a synonym, but rather creates a new
independent dfn which can be edited using the function editor.
|
D |
222 |
suggestion |
Throughout page
Rather than Activating a menu option, it should be selected. This may occur elsewhere in
the book.
|
D |
236 |
typo |
First paragraph or Spe-7
Remove "," immediately before last ;InEach.
|
E |
239 |
typo |
4th paragraph
"he may be able to restart the program" .. better to say "he may be able to resume or continue .."
|
E |
241 |
suggestion |
last line of 1.1.2
"or until we explicitly clear it by using )reset".
|
E |
244 |
suggestion |
the word obtuse
might be considered obtuse :-)
|
E |
249 |
suggestion |
×/ ⍳Max
If Max is too big, the result would be larger than the largest number that Dyalog APL can hold.
|
E |
249 |
typo |
1.3 )SI
Formatting wrong for )SI
|
E |
262 |
typo |
First paragraph, last line
"sometimes names Stops" should be "sometimes named Stops".
|
F |
286 |
typo |
4G⊂ ZZZ9' ⎕FMT MN
Comma unnecessary in commentary, which itself is incorrectly formatted.
|
F |
288 |
typo |
3.2.8 penultimate example
Commentary incorrectly formatted.
|
F |
289 |
typo |
3.3.2 first example
Commentary incorrectly formatted.
|
G |
302 |
debate |
1.2.1 first paragraph last line
"dynamic function" .. dfn or what ??
|
G |
308 |
typo |
2.2.1 second paragraph
"Take a look to" s/b "Take a look at".
|
I |
335 |
typo |
2nd bullet point
Remove first "one" from "items one from one another"
|
I |
344 |
content |
Penultimate paragraph
"more workspace than we have room for." Better "more workspace than is available."
|
I |
359 |
typo |
After definitions
First occurrence of hogwash is spelled hoqwash(sic).
|
I |
369 |
typo |
Penultimate paragraph, last line
One too many "then"s at the start of the line.
|
I |
418 |
content |
8.5 title
What is a fixpoint ?
|
J |
422 |
suggestion |
10.1.2
1. Replace "function editor" with "editor" .. it's the same editor,
no matter what's being edited.
2. Would the word "Signature" be better than "possible header structures" ?
|
K |
443 |
content |
Calculating Positions in a Matrix
In the first block of text on p443 the text reads "we can employ Decode ..".
That is incorrect - the text should read "we can employ Encode ..".
|
P |
629 |
content |
GUI_List function
For the example and the text to work, GUI_List[5] should read
[5] ⍝ 'Win.show'⎕WS 'Event' 'Select' 'ShowSel'
although the
parentheses are superfluous.
|
X |
758 |
content |
Solution to C-1
The result of the second expression of C-1 is incorrect:
12 6 27 ⌊ 11 + ⍳3
12 6 14
|
X |
772 |
content |
Solution to K-11
The algorithms used for matrix division and inverse have been improved in Version 13.0 onwards.
As a result of these improvements, the values of abc are closer to 2 ¯0.5 3.5 and therefore
3 5 ¯1+.×abc
returns 0 in 13.0 onwards.
|
Appendix 8 |
783 |
typo |
First sentence
.. are not developed ..
|
