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Epicurus
Dark Proggy House Beats
Registered: Feb 2004
Location: New Brunswick, NJ, US / Montreal, QC, Canada
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| quote: | Originally posted by trancaholic
Yes, it's a very CS perspective environment. I've used mathematical programming only once. I used it as a part of an algorithm for doing sensitivity analysis of utility conversion parameters in decision problems modelled in a specific framework (ie. "how much and little can I value human lives compared to dollars, if I act as I do"). A problem which could be mapped to a constraint satisfaction problem. A somewhat time-consuming mapping, due to the framework, but it seems to be the best that can be done.
What's your own field of study?
And why are you so on and off in this forum? (I can ask - this is the COR-thread ) |
Interesting. Was that part of the problem linear, non-linear, 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. I'm finishing up my PhD right now in the field of mixed-integer linear/non-linear programming & disjunctive pogramming. Basically working on developing new algorithms and improving others from the mathematical optimization perspective of things (cutting planes, polyhedral theory, combinatorics and so forth), and doing some constraint satisfaction on the side.
As for me being so on/off in this forum, I tend to get very busy with official research and non-official 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
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 Apr-13-2005 03:24 
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zig
Supreme tranceaddict
Registered: Dec 2004
Location: Dublin,Ireland
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| quote: | Originally posted by Shakka
So this is where everyone ran off to! I thought you were all off having ritualistic sex, but I see it is far worse. You have given a more attractive outlet for people in this forum to dumb themselves down to sub-100 IQ levels. I see it as a stunt to separate the champs from the chumps! Just kidding. But seriously...
I just noticed this sticky thread a few minutes ago because I rarely, if ever, looked at Occrider's economic updates. If I were a betting man, I'd say he was bored at work at the time and felt like unloading all of the data he was observing during the workday. But I digress.
It will be interesting to see where this thing goes and if it will outnumber the posts in that god awful Israeli/Palestinian threat. At this rate, it will happen in a matter of weeks.
So...a rambling from me. So I went to the Masters on Saturday, as some of you may know. Aside from driving to Augusta at 6AM, and walking around in mud for 7 hours, it was fucking awesome. I have never seen a more flawless piece of real estate. It was amazing to see so many top-tier, legendary players in one place. It was like being fully immersed in greatness on all sides. I can understand why some compare it to a slice of heaven on Earth. |
Yeah the threads been here for months  dont know how you never noticed....we all come in here with our six packs of beer and smoke a few joints together and have a friendly chat.....and then we venture outside into the forum and rip each other apart.....normal stuff really...... 
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Apr-13-2005 03:43 
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trancaholic
Danish Prophet of Doom
Registered: Oct 2000
Location: Aalborg
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| quote: | Originally posted by Epicurus
Interesting. Was that part of the problem linear, non-linear, 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 non-official 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.
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Apr-13-2005 04:24 
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