jhenk@hmcvax.claremont.edu (04/22/91)
In the File Manager section of Inside Mac Volume IV, there is a
very confusing diagram illustrating B* Tree (balanced binary trees,
right?) search paths. I suspect it is a misprint, but what do you
think? The search key is node 15, and instead of the path 8-13-15, the
search path takes 16-16-19.
For the record, I'm looking at the second printing - September
1986. (the edition with the Mac motherboard, keyboard and hand on the
front. Was it corrected later? Am I all wet? Well, we KNEW that, but
you know... Thanks in advance.
Jim Henk.keith@Apple.COM (Keith Rollin) (04/23/91)
In article <1991Apr21.164639.1@hmcvax.claremont.edu> jhenk@hmcvax.claremont.edu writes: > > In the File Manager section of Inside Mac Volume IV, there is a >very confusing diagram illustrating B* Tree (balanced binary trees, >right?) search paths. I suspect it is a misprint, but what do you >think? The search key is node 15, and instead of the path 8-13-15, the >search path takes 16-16-19. Yes, that is a misprint. You're the only other person I've known to notice that. I stumbled on it a few years ago when I was trying to decipher the HFS disk format. When I showed the page to one of the HFS engineers, he was competely taken aback! -- ------------------------------------------------------------------------------ Keith Rollin --- Apple Computer, Inc. INTERNET: keith@apple.com UUCP: {decwrl, hoptoad, nsc, sun, amdahl}!apple!keith "But where the senses fail us, reason must step in." - Galileo
dwright@sif.claremont.edu (04/23/91)
jhenk@hmcvax.claremont.edu writes: > > In the File Manager section of Inside Mac Volume IV, there is a > very confusing diagram illustrating B* Tree (balanced binary trees, > right?) search paths. I suspect it is a misprint, but what do you > think? The search key is node 15, and instead of the path 8-13-15, the > search path takes 16-16-19. > For the record, I'm looking at the second printing - September > 1986. (the edition with the Mac motherboard, keyboard and hand on the > front. Was it corrected later? Am I all wet? Well, we KNEW that, but > you know... Thanks in advance. > Jim Henk. [The figure he's talking about is Chapter 19, figure 14, on page 169. ] It definitely looks like a misprint to me-- the text directly contradicts the diagram ("Figure 14 shows a sample B*-tree search path; the arrows indicate a path to the second record in the second leaf node.") This was not corrected by the sixth printing. Maybe when Apple releases the second edition they'll fix it... - Dan Wright dwright@sif.claremont.edu