quote:  Originally posted by Epicurus
Interesting. Was that part of the problem linear, nonlinear, mixed integer? And what type of mathematical programming algorithm did you use? You'll definitely have to let me know about any future research with any kind of mathematical programming involved if you need help. 
Well, I *made* that part of the problem linear.
Basically, the work could be generalized to yield constraints of any kind, at a cost of more complex notation in the resulting article. As to how that part of the problem was solved: It was a "proof of concept"implementation to support my paper, so I simply got hold of a Java package that could do that part for me. Of course, getting to know the quirks of the API of the package I got hold of, and making it work with another general purpose linear algebra package and my own classes, turned out to be much more time consuming than had I written the entire thing from scratch myself.
The only thing I did that was remotely interesting from your point of view, was to invent a simple method for eliminating redundant constraints from my set of constraints, as that set was built. It was polynomial in the number of constraints already in the set and exponential in the dimensionality of the constraints. That suited me ok, as the number of constraints were always >>100 and the number of dimensions were <4 in nearly all cases.
Anyway, I did cry out for help quite a few times on specifics on mathematical programming, and apart from some professor who wanted me to buy his book, I didn't get much feedback from usenet. Next time I'll jump at you instead.
quote:  Originally posted by Epicurus
As for me being so on/off in this forum, I tend to get very busy with official research and nonofficial research (philosophy on the side) and need to cool off my brain from time to time. I tend to just post in the Montreal forum where the intellectual standards aren't as high as here 
Very interesting. I do the opposite: Start spending a lot of time here, and then cool my brain off by drinking beer with my office mate instead of doing research. Come to think of it, you're probably better off with your arrangement.
