| --- Log opened Mon Mar 07 00:00:49 2011 |
| 00:02 | <@Derakon> | Reiv: a method of generating a "complete" planar graph from a set of points that maximizes the angles between edges in the graph. |
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| 06:38 | | mode/#code [+o AnnoDomini] by Reiver |
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| 08:10 | | You're now known as TheWatcher[afk] |
| 08:44 | < Reiv> | Derakon[AFK]: That's pretty awesome. |
| 08:44 | < Reiv> | I like the graph, though you're right that the bottom right corner flawed out slightly |
| 08:45 | <@Vornicus> | Delaunay triangulation is a method of building connections over a set of points so that it's all made of triangles and the triangles maximize the minimal angles. |
| 08:47 | < Reiv> | So a way to make really big branches. |
| 08:47 | <@Vornicus> | The best way I found of actually describing it is it's the dual of the voronoi diagram: the voronoi diagram draws polygons around each point in the set so that if you're in a particular polygon, you're closer to the corresponding point than to any other point in the set. |
| 08:47 | < Reiv> | hm |
| 08:47 | < Reiv> | Is there a picture of that? |
| 08:48 | <@Vornicus> | So then the delaunay triangulation shows, instead of the polygons themselves, what points' polygons are direct neighbors of each other. |
| 08:48 | <@Vornicus> | http://en.wikipedia.org/wiki/Voronoi_diagram |
| 08:49 | < Reiv> | ... Oh, right |
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| 08:49 | < Reiv> | The picture in this case really was worth a thousand words~ |
| 08:51 | < Reiv> | Basically a diagram of "Which point is closest" as done with polygons? |
| 08:51 | <@Vornicus> | So on that picture up there, that point in the green diamond-shaped polygon, in this thing's delaunay triangulation, would be connected to the one in the pink polygon, the one in the dark blue lozenge, the one in the royal blue thing, the one in the dark grey thing, and the one in the teal thing. |
| 08:51 | <@Vornicus> | and possibly (depending on how that actualy works out in that corner there) the one in the very dark blue polygon. |
| 08:52 | <@Vornicus> | That's the voronoi diagram, yes. |
| 08:52 | <@Vornicus> | And then the delaunay triangulation is a graph that just connects neighbors in the voronoi diagram. |
| 08:53 | <@Vornicus> | http://en.wikipedia.org/wiki/File:Delaunay_Voronoi.png This image shows the voronoi diagram (in red) and the delaunay triangulation (in black) for the same set of points (in black) |
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| 08:54 | | mode/#code [+o Attilla] by Reiver |
| 08:56 | < Reiv> | Aha, yes I see |
| 08:56 | <@Vornicus> | Der is using the delaunay triangulation of the points, then drawing a spanning tree on those -- which is to say that he's taking the triangulation and removing loops by deleting edges, without breaking up the graph as a whole. |
| 08:56 | < Reiv> | I had the guess right. |
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| 18:42 | < gnolam> | http://www.lysator.liu.se/~gnolam/temp/groda_ppt.png <- the best illustration I've ever seen in a serious powerpoint presentation. |
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| 18:48 | | * TheWatcher blinks |
| 18:48 | < TheWatcher> | Um |
| 18:48 | < TheWatcher> | What. |
| 18:50 | < Namegduf> | Doomguy got turned into a frog. |
| 18:54 | < gnolam> | Apparently, soil contamination is very saddening for frogs. |
| 19:00 | < Namegduf> | Ah. |
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| 20:43 | < SchoolPhox> | So, let's say I'm using function macros. I've got two, #define ADDR(X) (*((unsigned int*)(X))), and #define TC_CCR(X) ((X) * 0x40) + 0x00) |
| 20:44 | < SchoolPhox> | Now, I need to use the second macro within the first, but when I do that, I get an error saying it expects a semicolon before the closing bracket. |
| 20:44 | < SchoolPhox> | Is the syntax wrong for the second macro? |
| 20:45 | <@McMartin> | The second macro has two opening parentheses and three closing parentheses. |
| 20:45 | < SchoolPhox> | Fffffff |
| 20:46 | < SchoolPhox> | Sorry\ |
| 20:46 | < SchoolPhox> | That fixed it |
| 20:49 | < SchoolPhox> | I feel dumb, because I definitely spent over an hour reading up on pre-processor directives, trying to figure out what could possibly be wrong |
| 20:49 | <@McMartin> | ADDR is a fairly horrifying macro, that said. Are you doing embedded programming or something? |
| 20:51 | < SchoolPhox> | Yeah. |
| 20:52 | < SchoolPhox> | I actually don't know too well what it's doing |
| 20:53 | < SchoolPhox> | It's something I got from my instructor a few years ago, that I make sure I copy over. |
| 20:53 | < SchoolPhox> | pointer to a casted pointer? |
| 20:55 | <@McMartin> | It looks like you're feeding it an integer |
| 20:55 | <@McMartin> | So you're saying "I'm good for it; we need the integer at 0xA0000000, stat" or what have you |
| 20:55 | < simon_> | it's funny that it's called ADDR when what it does is a dereference. |
| 20:56 | <@McMartin> | It's BASIC's PEEK. |
| 20:56 | < SchoolPhox> | Probably because it's used to reference directly an address space |
| 20:56 | <@McMartin> | And that kind of thing being usable usually implies no virtual memory mapping and direct I/O,yeah |
| 20:56 | < SchoolPhox> | ARM processor, AT9SAM7X |
| 20:57 | < SchoolPhox> | But, gotta vanish |
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| 21:04 | <@AnnoDomini> | Using a bash script (used for launching an application), is it possible to capture the console output of said application to a file, without having to run it in terminal? |
| 21:05 | < Namegduf> | >file |
| 21:05 | < Namegduf> | Works as well in a shell script as out. |
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| --- Log closed Tue Mar 08 00:00:50 2011 |