9,538 reputation
12042
bio website en.wikipedia.org/wiki/…
location United States
age 70
visits member for 4 years, 3 months
seen Dec 25 at 2:56

BS Mechanical Engr.
PhD CS(AI)
CS Prof (4yr)
Numerous consulting jobs.
15 yr at http://www.pharsight.com
Published book on CS & several articles
4 kids, 2 grand
Pilot(student)

P.S. The picture is a Beta-prime distribution. It shows the program speedup factors you can get if you see a problem twice in 2, 3, 4, and 5 samples.


Oct
8
comment What is a Ph.D. good for in the software industry?
++ Interesting that you bring up the issue of locale. I'm originally from the middle of the US, and there does seem to be a local perspective.
Oct
4
comment Why is Lisp useful?
++ Makes sense, especially the last sentence.
Oct
4
comment Why is Lisp useful?
@Mark: Great movie.
Oct
3
comment I am in a rather difficult work situation. Should I stay or should I go?
Excellent question. Widely applicable.
Oct
3
comment I am in a rather difficult work situation. Should I stay or should I go?
++ Very wise, especially the part about staying in the job while you look for another.
Oct
2
comment I am in a rather difficult work situation. Should I stay or should I go?
@Bob: I'm sure you're right. I haven't worked at any (well, maybe one - a lottery business). Some were just trying to start up something that sounded good so they could sell it in a few years and go buy a yacht.
Sep
27
comment Is Java “dead in the water” as a consequence of Oracle buying Sun and subsequently suing Google
@Dean J: Well, my examples are DAO, Fortran, and C/C++. We built a product, using a 3rd-party grid control, based on DAO, and the programmers move on. Whattayaknow - MS tries to rip it out from under us. Fortran (not that I like it): try to stick with one compiler - you can't, you gotta keep buying new ones, 'cause the old ones don't work with customers' new machines. Same for C and C++. But what if I don't WANNA do .net? What if I LIKE VC? Too ****ing bad, soldier.
Sep
27
comment Is Java “dead in the water” as a consequence of Oracle buying Sun and subsequently suing Google
@Dean J: That's good. I'm thinking of how IBM used to trap people with EBCDIC and special-format punch cards, while DEC had simple ASCII-stream IO, very simple, that didn't trap anybody. Then DEC got big, and they started trying to lock people in with fancy terminals with special codes. Then I think of Microsoft, and the series of compilers, databases, etc. they try to trap people into. If Sun & Oracle are resisting the temptation to corner a revenue stream, great. I'm sure they've got marketing staff asking "Why are we doing this?"
Sep
23
comment How to Subtly Tell a Professor About our Poor Programming Assignments?
That's a good idea. The only problem is, profs are loathe to criticize one another's teaching style, because they have to work with them, and it could boomerang.
Sep
23
comment How do you dive into large code bases?
+1 Yeah, that's what I do too, but I don't know of any way to make the job easy. In my experience, it can take weeks before I feel safe making any changes, and months before I'm "at home" in the code. It certainly helps if you can ask questions of the developers.
Sep
17
comment When should I care about performance?
++ FALSE DICHOTOMY! Will they never learn? When you find and fix a performance problem, the code is not only quicker, it's better. I only regret that I have but one upvote to give!
May
30
comment How to become a “faster” programmer?
++ If I could expand on the chair - you need to sit upright, have good lumbar support, have your keyboard / mouse down low, and your monitor up high so you are looking straight at it. The chair should support your forearms and not your elbows. Ideally it should give good ventilation to carry away perspiration.
Feb
4
comment Why hasn't a faster, “better” language than C come out?
@Pestilence: I've heard that, but I haven't seen it. I've seen plenty of C and Fortran, including lately. I haven't seen any case where the ASM that Fortran generates could not be equaled by C in the hands of a competent programmer. Maybe it exists, but I haven't seen it.
Jan
26
comment Why hasn't a faster, “better” language than C come out?
I think the idea that Fortran is faster than C is somewhat myth, depending on what's being coded and who's doing it. The reason heavyweight numeric libraries are in Fortran is not because Fortran is faster, but because the routines were originally coded in Fortran and few people have the nerve or need to re-write it. The small number of math-gurus who write and vet these algorithms are happy in Fortran and see no need to change, especially since they imagine Fortran is faster.
Sep
12
comment How to become a “faster” programmer?
... and the idea that performance works against maintainability is also another common idea that many people believe, but isn't necessarily so. This field has a lot of those beliefs.
Sep
12
comment How to become a “faster” programmer?
... I know it's counterintuitive, but that's my experience. The link I gave above is a pretty good small example of how by tuning a "pretty good" program you can make it both faster and smaller, and learn from the experience.
Sep
12
comment How to become a “faster” programmer?
@Jim: Certainly you want to avoid the premature optimization part, because that is another form of guessing. What I've found, though, is if you take a big program, and do performance tuning on it, you find out that what makes it slow is also what makes it big. That experience leads to designing things better in the future, so they are simpler, faster, and smaller. But without the tuning experience, you don't learn that lesson.
Sep
11
comment How to become a “faster” programmer?
... and it's not only the time you spend writing the email, but the time it takes to get your head back into the code from where you left off. For me, that's the daunting part.
Apr
21
comment When is it reasonable to create my own programming language?
@Dog: From an AI viewpoint, that would be ideal. Take a look at differential execution. That's a real example of cutting the source code by an order of magnitude. Boilerplate may be necessary, but it's not a good thing.
Mar
25
comment Have you dealt with space hardening?
And, have all the failure responses thoroughly planned, on the conviction that they will be needed.