| --- Day changed Sat Jun 06 2009 | ||
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| fenn | i wonder why `wget -rk -np edboyden.org/sb1/` doesnt work | 07:47 |
|---|---|---|
| fenn_ | beats me | 07:47 |
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| fenn | oh it's a wonky redirect to alumni.media.mit.edu | 07:51 |
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| kanzure | heh | 10:40 |
| kanzure | http://askaphd.org/ | 10:40 |
| kanzure | bah only 19 users | 10:40 |
| kanzure | what a piece of shit | 10:40 |
| nsh | kanz, you have lots of phd emails | 10:56 |
| nsh | why not solicit them all to join | 10:56 |
| Utopiah | posting the link on PhD Comic http://www.phdcomics.com/ could help http://www.alexa.com/siteinfo/phdcomics.com | 10:59 |
| fenn | qtparted | 11:00 |
| kanzure | it's not installed on knoppix | 11:06 |
| fenn | LOVE: http://www.youtube.com/watch?v=Y-A8xvFKaRA | 11:39 |
| fenn | http://www.quelsolaar.com/ | 11:40 |
| fenn | eskil steenberg | 11:40 |
| fenn | automatic story/architecture/landscape generation | 11:40 |
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| --- Log opened Sat Jun 06 13:16:43 2009 | ||
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| --- Log closed Sat Jun 06 13:18:43 2009 | ||
| --- Log opened Sat Jun 06 13:23:26 2009 | ||
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| kanzure | ok now I don't have any excuse not to use screen | 13:29 |
| kanzure | SYMPA: https://utlists.utexas.edu/sympa/ | 13:42 |
| kanzure | ashkenazi papers that I was talking about: http://heybryan.org/books/papers/ashkenazi/ | 13:43 |
| kanzure | also has a notes.txt file | 13:43 |
| fenn | my papers folder: http://pastebin.ca/1449973 | 14:07 |
| kanzure | rawr give me unit test suite | 14:21 |
| drazak_ | screen is awesome | 14:21 |
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| fenn | kanzure: try `git clone http://192.168.1.86/git/skdb.git/` | 14:39 |
| kanzure | works | 14:44 |
| kanzure | http://ktown.kde.org/~zrusin/git/git-cheat-sheet-large.png | 14:48 |
| kanzure | git-update server info | 14:51 |
| fenn | git update-server-info | 14:51 |
| fenn | git clone http://192.168.1.87/skdb/.git/ | 14:57 |
| fenn | git pull http://192.168.1.108/skdb/.git/ master | 14:58 |
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| kanzure | a = array([[10,20,30],[40,50,60]]) | 15:26 |
| kanzure | a[:,1] | 15:26 |
| kanzure | wtf? | 15:26 |
| kanzure | from numpy import * | 15:27 |
| fenn | 'slartibartfast'.split('a')[:2] | 15:30 |
| fenn | should return ['sl', 'rtib'] | 15:30 |
| kanzure | ab = [[10,20,30,40],[50,60,70,80,90]] | 15:33 |
| kanzure | del ab[0] | 15:33 |
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| kanzure | dynaflexpro | 15:47 |
| fenn | suxtehgoatse | 15:48 |
| kanzure | goatse doesn't do dynamics. | 15:48 |
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| kanzure | http://www.pokemondb.co.uk/gallery | 16:02 |
| splicer | (that's a lot of pokemons) | 16:09 |
| splicer | fenn: remember when I talked about the pirates in the european parliament? | 16:11 |
| splicer | ...the election is tomorrow | 16:11 |
| kanzure | "An important result from linear graph theory is that the fundamental cutset matrix is row-equivalent to the reduced incidence matrix. In other words, the f-cutset matrix need not be constructed using its definition- it can be obtained through simple row operations on the reduced incidence matrix. Verification of this theorem for the linear graph in fig 2 is left to the reader." | 16:16 |
| kanzure | this doesn't actually say anything, does it? | 16:16 |
| kanzure | all this crap about the identity matrix being partitioned into the cutset matrix is just them being jerks | 16:19 |
| kanzure | basically it's a way of organizing the matrix so that they don't have to order it by hand or something | 16:19 |
| kanzure | because the other part of the matrix that they add to it (with dimensions of (v-1)*(e-v+1)) to the right of it, complements the identity matrix such that the identity matrix's column number for a certain value, plus the values in the remaining columns for a given row, says whether or not those thingies (specified by each column) appear within the same set | 16:20 |
| kanzure | that probably didn't explain anything | 16:20 |
| kanzure | you know, cutsets probably have some sort of non-esoteric application to reliability theory | 16:35 |
| kanzure | i.e. probabilities of certain edges in certain dependencies being cut that really-shouldn't-go-down-all-at-the-same-time etc. | 16:35 |
| wrldpc | anyone have the quicklink to the anti-grav treatment using the enclosed pulley system? | 16:39 |
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| kanzure | HOW TO FIND FUNDAMENTAL CUTSETS (slide 8/16) | 17:07 |
| kanzure | 1. Redraw the graph with the tree in a straight line. tree=hamiltonian. | 17:07 |
| kanzure | 2. For each tree branch, | 17:07 |
| kanzure | 2a/) place the tree branch in a new f-cutset | 17:07 |
| kanzure | 2b) see what two node groups are formed by cutting that branch | 17:07 |
| kanzure | 2c) place all links in the co-tree that connect these two groups in that cut set. | 17:08 |
| kanzure | dear lazyweb, .. | 17:08 |
| kanzure | this would be easier if I wasn't using an incidence matrix to represent a graph | 17:08 |
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| fenn | "redraw the graph with a tree in a straight line" very funny. ha. ha. | 17:17 |
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| fenn | assuming springs are nodes and masses are arcs, the node has a parameter/label/value (the spring constant) and the arc has a value (the mass) | 18:51 |
| fenn | but springs as arcs makes more sense, because you connect things together with springs | 18:54 |
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| kanzure | http://box2d.org/ | 19:24 |
| kanzure | adding in series, multiplying in parallel | 19:25 |
| kanzure | dump assembly graph into box2d input format thingy (or multisim, dynaflexpro, etc.) | 19:25 |
| kanzure | but there doesn't seem to be a sufficient generic tool for static analysis like that | 19:25 |
| kanzure | so generating the equations and then dumping it into graphsynth seems like an ok thing to do. | 19:26 |
| kanzure | s/graphsynth/gnuplot/ | 20:19 |
| kanzure | http://www.aero.polimi.it/~mbdyn/index.html | 20:39 |
| kanzure | http://www.vimeo.com/4837929 mbdyn video thingy | 20:41 |
| kanzure | http://tmech.mechatronik.uni-linz.ac.at/staff/gerstmayr/hotint.html | 21:15 |
| kanzure | http://pyode.sourceforge.net/tutorials/tutorial2.html | 21:32 |
| kanzure | so they just call various set mass and set position functions and call stuff spheres or joints, and that's it basically | 21:32 |
| kanzure | but that doesn't really sound right | 21:33 |
| kanzure | all these different dynamic libraries have them in their own special API and then simulate stuff but you have no idea how they are assembling the mechanical assembly or something | 21:33 |
| kanzure | blargh | 21:33 |
| kanzure | # Simulation method: The equations of motion are derived from a Lagrange multiplier velocity based model due to Trinkle/Stewart and Anitescu/Potra. | 21:36 |
| kanzure | http://opende.sourceforge.net/wiki/index.php/Manual_(All) | 21:36 |
| kanzure | http://www.google.com/search?hl=en&client=iceweasel-a&rls=org.debian%3Aen-US%3Aunofficial&num=100&q="open+dynamics+engine"+"equations+of+motion"&btnG=Search&aq=f&oq=&aqi= | 21:55 |
| kanzure | er | 21:55 |
| kanzure | http://tankammo.com/xode/ | 21:55 |
| kanzure | XML ODE data interchange format | 21:56 |
| kanzure | http://tankammo.com/xode/xode.txt | 21:56 |
| kanzure | see /usr/include/ode/odemath.h | 21:59 |
| kanzure | after: | 21:59 |
| kanzure | apt-get install python-pyode python-pyode-doc libode-doc libode0-dev libode0debian1 | 22:00 |
| kanzure | Mechatronic Systems - Modelling and Simulation with HDLs (Georg Pelz, 2003). hrm. I should go stalk this down. | 22:33 |
| kanzure | A survey of customised computer algebra programs for multibody dynamic modelling | 22:37 |
| kanzure | "it is postulated that the sum of forces at every point, and the sum of displacements for every closed loop, are zero, and this leads to development of equations of motion using relationships between forces and displacements" | 22:40 |
| kanzure | [28] contains a "copious compilation" of bond graph references | 22:42 |
| kanzure | Coriolis effects in high-speed robot control? | 22:47 |
| kanzure | "BREEDVELD, P.C. Rosenberg, R. C. Zhou, T. Bibliography of bond graph theory and application". J Franklin Inst. 1991, 328, (5/6), pp. 1067-1109. | 22:53 |
| kanzure | http://mtt.sourceforge.net/examples/Mechanical_rep/index.html | 23:05 |
| kanzure | http://mtt.sourceforge.net/examples/Mechanical_rep/node114.html | 23:05 |
| kanzure | http://mtt.sourceforge.net/examples/Mechanical_rep/node200.html | 23:06 |
| kanzure | there we go | 23:06 |
| kanzure | that looks like what I want.. | 23:07 |
| kanzure | generating octave goodness: http://mtt.sourceforge.net/examples/Chemical_rep/node60.html | 23:10 |
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| kanzure | "polytropic constitutive relationship" | 23:27 |
| kanzure | in /usr/share/mtt/lib/cr/perl/ | 23:27 |
| kanzure | apply_cr.pl in that dir is interesting | 23:28 |
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| kanzure | er | 23:57 |
| kanzure | wtf is this | 23:57 |
| kanzure | http://heybryan.org/~bbishop/docs/InvertedPendulumOnCart_ese.r | 23:57 |
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