I had promised that the *.dat files would never change, but I learned later
that miles.dat as originally distributed used the wrong two-letter state
codes for Nebraska and Saskatchewan. This was politically incorrect.
I decided to change to the correct codes, since this won't affect any
of the data that's critical for the graph structure. Please replace your
copies of miles.dat (and cities.texmap) if they are dated earlier than 1995.

----------------------------------------

Here is a list of all changes known to date that will appear in the fourth
printing of The Stanford GraphBase book. Most of these corrections were
already made in the second printing, and almost all were in the third. If you
know of an error not listed here, chances are good that you can earn a reward
by reporting it to sgb@cs.stanford.edu. [Note that comparison between pointers
from differently calloc'd regions of memory is not considered erroneous; see
the README file.]  Many thanks to the readers who reported these glitches.

Page 1, line 17: should say The eleven data files *.dat occupy 355,155 bytes

Page 10, line 9: should say John Lewis Roget

Page 14, line 6: change "it is" to "is"

Page 20, line 1: change "&" to "\&"

Pages 22 and 24: the illustrations are too low

Page 22: should say Regina, SK and Scottsbluff, NE

Page 26, insert at beginning of line 17: (In rare cases, the triangle
inequality will fail.)

Page 26, line 17: $2^14$ is, of course, 16384

Page 28, line 2: should say "is much more difficult than the"

Pages 29 and 30: change "dominos" to "dominoes" (7 times)

Page 33, line 14: insert thin space before "..."

Page 34: remove extra comma in the caption to Figure 11

Page 40: remove the first "poset," on line 19

Page 45, line 12: change "under under" to "under"

Page 45, line 23: change "279" to "239"

Page 46, line 4 from the bottom: industry $j$, not industry $k$

Page 52, line 5: change "the vertices" to "two vertices"

Page 58: numbered line 61 should end "+The+Stanford+GraphBase+"

Page 58: numbered lines 69 and 70 should end with double quotes

Page 59: insert change "test" to "./test" on numbered lines 87, 88, 89, 93

Page 60: change "-o foo" to "-o foo foo.c" in both displayed command lines

Page 62: line 25: change "lines 92--96" to "lines 73--77"

Page 75: remove semicolon at end of line 2

Page 78: the long-double-dash notation used on lines 15 and following is
changed to a heavy bar

Page 78: in display (*) and the following lines, use notation like $r^{(0)$
and $c^{(1)}$ instead of $r_0$ and $c_1$

Page 78, line 7 from bottom: change "matrix" to "matrix, of size $n\times n$"

Page 81, line 14: change "row $l$" to "column $l$"

Page 90, lines -10 and -9: remove the semicolons

Page 99, line 6: change "x --- y" to "y --- z"

Page 121, line 4 should say: "assume that |BUF_SIZE| is rather large,
but in cases of doubt they ensure that |BUF_SIZE| will never be exceeded."

Page 156, lines 16 and 17 should be replaced by the following:
removed. Regardless of the value of |copy|, information that might
have been present in the utility fields will not be copied, and arc
lengths will all be set to 1.

Page 160, line -5: change "panic(no_room+1)" to "panic(missing_operand)"

Page 163, line 19: change "panic(no_room+1)" to "panic(missing_operand)"

Page 168, line 9: change "panic(no_room+1)" to "panic(missing_operand)"

Page 182, line -9: change "their weights" to "their statistics"

Page 184, line -6: change "their weights" to "their statistics"

Page 184, line -2: change "check sum" to "checksum"

Page 194, line 15: change "awhile" to "a while"

Page 194, line -7: change "hh==NULL" to "!hh"
(i.e., change $hh\equiv\Lambda$ to $\lnot hh$)

Page 216, lines 8 and 9: The period length of the generated numbers is
$2^{85}-2^{30}$.

Page 217, line 3: the recurrence should be $a_n=(a_{n-55}-a_{n-24})\bmod m$

Page 217, insert a new paragraph at the beginning of section 6:
The numbers generated by |gb_next_rand()| seem to be satisfactory for most
purposes, but they do fail a stringent test called the ``birthday spacings
test,'' devised by George Marsaglia. [See, for example, {\sl Statistics and
Probability Letters\/ \bf8} (1990), 35--39.] One way to get numbers that
pass the birthday test is to discard half of the values, for example
by changing `|gb_flip_cycle()|' to `|gb_flip_cycle(),gb_flip_cycle()|'
in the definition of |gb_next_rand()|. Users who wish to make such a change
should define their own substitute macro.

Page 218, line 5: change "mod" to "divided by"

Page 282, after #include <stdio.h>: also say #include <stdlib.h> (twice)

Page 287, insert a new paragraph after line 4, to wit: {\sl Important Note:\/}
Programs of the Stanford GraphBase implicitly assume that all memory allocated
by |calloc| comes from a single underlying memory array.  Therefore pointer
values are compared to each other in many places, even when the objects
pointed to have been allocated at different times. Strictly speaking, this
liberal use of pointer comparisons fails to conform to the restrictions of
ANSI Standard \CEE/, when the comparison involves a less-than or greater-then
relation. Users whose system supports only the strict standard will need to
make several dozen changes.

Page 288, section 18, line 11: replace "g->uu.I++;" by the code
   { g->uu.I++; printf("."); fflush(stdout); }
and make entries for fflush and stdout in the mini-index on page 289

Page 303, line 2: change "check sum" to "checksum"

Page 304, line 8: change "is none" to "if none"

Page 304, line 20: change "81" to "sizeof(buffer)"

Page 305, line 15: change 100 to |unexpected_char|

Page 306, bottom line: change "icode[*p]" to "imap_ord(*p)"

Page 308, replacement for 3rd line from bottom:
  icode[0]=d; /* make sure '\0' is a nondigit */
  if (imap_ord(*cur_pos)<d) return icode[*cur_pos++];

Page 309, line 5: change "icode[*cur_pos]" to "imap_ord(*cur_pos)"

Page 312, line 12: change "#endif DATA_DIRECTORY" to "#endif"

Page 312, line 18: change "19" to "sizeof(file_name)-1"

Page 312, line 9 from the bottom: change "5-letter" to "five-letter"

Page 312, bottom line: the comma should be in typewriter type

Page 320, line 14: we want to compute $\langle 2a_0, a_0+a_1, 2a_1 \rangle$

Page 323, line 16: change "check sum" to "checksum"

Page 332, line -7: change "decidegrees" to "centidegrees"

Page 330, line 17: change "util_types[6]" to "util_types[7]"

Page 335, section 10: the variables should all be declared static
(this affects the mini-indexes on pages 337, 339, 341)

Page 336, lines 22 and 23: change "SA" to "SK" and delete the sentence
about New Brunswick vs Nebraska (Nebraska changed from NB to NE long ago!)

Page 346, line 14 (display): insert ")" before final comma

Page 346, line 5 of section 9: the sentence should begin "The utility
field |z_coord| must contain a unique ID number"

Page 352, line 7, change "that that" to "that"

Page 354, section 23. The displayed formulas should define functions
ff, gg, hh, and jj (not f, g, h, and j)

Page 366, section 2, line 6: should say {1,3,4,9,10,12}

Page 374: this commentary was not precisely correct; the revised version
can be found in file gb_raman.w in the current sources

Page 376, line 12: change "$p-a^2-2c^2$" to "$p-a^2-b^2-2c^2$"

Page 386, line 21: change (25,m,...) to (31,m,...)

Page 400, section 7: the variables should both be declared static
(this affects the mini-index on page 403)

Page 410, replacement for the four last lines:

  13. define buffer (&item_buf[MAX_SV_STRING+3])
                          /* the last 81 chars of |item_buf| */
  <Private variables  8>=
   static char item_buf[MAX_SV_STRING+3+81]; /* an item to be output */

Page 413, line 10: change "output; in" to "output; the value $-3$ will be
returned if memory is exhausted. In"

Page 414, line 5: remove the semicolon

Page 414, swap lines 7--8 with with lines 9--10

Page 414: last line should end ", or if comparisons between pointers are
undefined."

Page 415: new line of code to follow line 12:
 if (blocks==NULL) return -3; /* out of memory */

Page 426, line 13: change "common words" to "common five-letter words"

Page 430: the bottom few lines should move to page 431

Page 436, section 17: node_blocks should be declared static
(this affects the mini-indexes on pages 433 and 439)

Page 442, line 23: change "3,675,808" to "3,674,808"

Page 444, section 6, line 4: insert "n-vertex" before "regular"

Page 444, section 7, line 3: should be superscript g, not subscript

Page 445, line -6: change "4*q*2" to "4*q*q"

Pages 452 and 453: change "rand" to "randm" (six times)

Page 461, line 16: remove the semicolon

Page 466, line 12 from the bottom: remove the semicolon

Page 490, line 19: remove the semicolon

Page 497, line 2: change "respect" to "respect to"

Page 497, line 18: change "1000" to "100"

Page 512, section 2, line 9: remove the semicolon

Page 537: add "GB_GRAPH 18," to the index listings for fflush

Page 543: section numbers in the index listings for panic_code should not
be underlined except in GB_GRAPH

Page 545: add "GB_GRAPH 18," to the index listings for stdout

Page 547: add section 10 to the index listings for unexpected_char in GB_IO

Page 557: "all_parts(10)" should be "all_parts(10,0)"

Page 558: "all_perms(5)" should be "all_perms(5,0)"

Page 561: "all_perms(7)" should be "all_perms(7,0)"

Page 568, line 5: change ". 15" to ", 15"

Pages 568 and 569: insert thin space after the comma when giving issue
numbers, in references [5], [9], [15], [16], [23], [30], [31].

Page 572: "Jarn{\'\i}, k" should be "Jarn{\'\i}k"

Page 573: should say "literate programming" not "literate programmming"

Page 573, Marsaglia, George, 217

Page 574: permutations, random, 104

Page 574: should say Roget, John Lewis

Page 575: should say "Tolsto\u\i, Lev Nikolaevich"

Page 575: add page 26 under triangle inequality

Page 575: Voronoi's correct name is "Vorono\u\i, Georgi\u\i\ Feodos'evich"

Refinements to spacing between lines, relevant to section names like
<Local variables>, have also been made on pages 75, 124, 131, 137, 140,
146, 150, 156, 158, 160, 163, 168, 174, 182, 204, 225, 318, 324, 329,
334, 367, 399, 414, 433, 466, 490.