| --- Log opened Mon Apr 28 00:00:34 2014 |
| 00:01 | <@AnnoDomini> | And in this case it's accessing C64's code memory? |
| 00:01 | <&McMartin> | I have a half-formed idea that I could probably write a macro language for getting access to floating-point in machine language code now, but not just with this. |
| 00:01 | <&McMartin> | The larger thrust is more "reverse engineering the in-software floating point capabilities" |
| 00:02 | <&McMartin> | FPEEK in particular came up because Vorn was digging into how it did stuff like SIN and COS, and it turns out it does them by computing power series |
| 00:03 | <&McMartin> | So, uh, I guess the answer is "It already was used to extract the coefficients of that power series" |
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| 02:06 | | * McMartin deploys hideous unnatural tricks against a Subversion repository |
| 02:07 | <&McMartin> | We really cannot switch to git soon enough |
| 02:18 | <&Derakon> | I'm using git's SVN integration at work. It's kind of hokey. |
| 02:18 | <&Derakon> | Better than not being able to commit except to master, though! |
| 02:18 | <&McMartin> | Heh |
| 02:19 | <&McMartin> | Yeah, we're using actual branches in SVN here, which makes life... exciting |
| 02:19 | <&McMartin> | But it's late enough in SVN's development that SVN branches at least actually work |
| 02:19 | <&ToxicFrog> | I think git-svn can map SVN branches to/from git branches these days |
| 02:19 | <&McMartin> | I abandoned a branch, then recreated it with the same name, then merged in some changesets from its previous incarnation. |
| 02:20 | <&ToxicFrog> | So basically a rebase -i that blows away a bunch of commits? |
| 02:20 | <&McMartin> | I am pretty sure I can draw what that operation is in Git~ |
| 02:20 | <&McMartin> | Kinda |
| 02:21 | <&McMartin> | In Git, this would be "various commits from the branch were rebased or merged into master, and then the branch head was moved to trunk abandoning all other commits, then rebranched by cherry-picking some commits from the old branch" |
| 02:22 | <&McMartin> | The problem boiled down to 'too much refactoring distance between these branches making merges either direction problematic; save what you care about, and the rest wasn't worth saving except for two commits that could have merged but aren't ready for master yet" |
| 02:23 | <&McMartin> | ... I guess that *is* a rebase -i that blows away a bunch of commits. Basically all the commits that hadn't already been merged, save one. |
| 02:23 | <&ToxicFrog> | Yeah. |
| 02:24 | <&McMartin> | Yeah, OK, now it's not terribly exciting on either side~ |
| 02:24 | <&ToxicFrog> | Like, you can also do it that way, but at that point you have basically recreated one specific usage of rebase -i more awkwardly. |
| 02:24 | <&McMartin> | Yeah |
| 02:24 | <&McMartin> | (not hugely awkward in SVN either; svn delete, svn cp, svn merge) |
| 02:24 | <&McMartin> | (And Tortoise SVN Merge gives you a screen that is not entirely unlike rebase -i) |
| 02:25 | <&McMartin> | (A number of my changesets from this branch had names like "The Great Purge") |
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| 11:31 | <@Azash> | http://imgur.com/r/programmerhumor/sCl963V |
| 11:31 | <@AnnoDomini> | Heh. |
| 11:43 | <&McMartin> | itty-bitty semantic operations space |
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| 12:58 | <@TheWatcher> | Ohgods |
| 12:58 | <@TheWatcher> | This student's code |
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| 15:11 | <@gnolam> | TheWatcher: is it so bad that it creates rifts in the spacetime continuum? |
| 15:11 | <@TheWatcher> | no, it's too broken to break anything else |
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| 16:25 | | * Tarinaky throws up from how bad her CPP is after not writing any for ages. |
| 16:25 | <@Tarinaky> | Also, being frazzled and rushing doesn't help |
| 16:26 | < Datawalke> | Why are you rushing? |
| 16:42 | <@Tarinaky> | This is due in the 8th |
| 16:42 | <@Tarinaky> | And I need to leave 3 days to have it 'bound'. |
| 16:42 | <@Tarinaky> | And I haven't done /any/ of the report |
| 16:42 | <@Tarinaky> | And I'm struggling to remember how to do a cross product and how to apply it to my problem |
| 16:42 | <@Tarinaky> | Because past Tarinaky was cleverer than future Tarinaky |
| 16:43 | <@Tarinaky> | Or at least was more confident with trigonometry based magic |
| 16:46 | < Datawalke> | :( I'm sorry. I'm sure you will get it. |
| 16:47 | <@Tarinaky> | I got it. |
| 16:47 | <@Tarinaky> | Just super-stress-y |
| 16:50 | <@Tarinaky> | Was thinking of the cross product as being the complement to the dot product of two vectors. |
| 16:50 | <@Tarinaky> | So my vector along the magic vector is the dot product... |
| 16:50 | <@Tarinaky> | And my vector perpendicular to the magic vector is the cross product |
| 16:51 | <@Tarinaky> | :) |
| 16:51 | <@Tarinaky> | I suck at explaining my head :/ |
| 16:52 | < Datawalke> | It's all magic to me. |
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| 16:56 | <@Tarinaky> | Okay. Brain fart time. I have a vector that's my velocity, and a magic vector which is the direction I want to be travelling in. |
| 16:56 | <@Tarinaky> | The dot product of the two vectors is the projection of one on the other - my actual speed in the direction I want to be travelling in. |
| 16:56 | <@Tarinaky> | Am I being a massive derp to think I can use the cross product as the compliment to get the speed in the direction perpendicular to that? |
| 16:57 | <@Tarinaky> | I say this because I'm doing the maths component wise. |
| 16:58 | <@Tarinaky> | And neither vector is aligned with the basis. |
| 16:58 | <@Tarinaky> | So I'm getting confused that the cross product is giving me the vector up/down. |
| 16:58 | <@Tarinaky> | And therefore wrong. |
| 16:59 | <@Tarinaky> | But at the same time the angular forms of the dot/cross product made me think this'd work as the sin**2 a + cos**2 a = 1 identity looks a lot like pythagoras' theorem. |
| 17:01 | <@Tarinaky> | Am I missing something important here? |
| 17:10 | <@Tarinaky> | Yeah. The internet says my thinking's right. |
| 17:10 | <@Tarinaky> | The direction is irrelevant, the magnitude is right. |
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| 19:35 | < Batam> | . |
| 19:35 | <@ErikMesoy> | Batman! |
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| 19:36 | <&McMartin> | Vanished into the night. |
| 19:37 | <&McMartin> | magnitude of the cross product is the area of the parallelogram implied by the two vectors |
| 19:41 | <@Tarinaky> | McMartin So I need to divide through by the dot product to get what I want? |
| 19:41 | <@Tarinaky> | That sounds right actually. |
| 19:42 | <@Tarinaky> | No. It doesn't. |
| 19:42 | <@Tarinaky> | I need to divide by the magnitudes of the two vectors on their own? |
| 19:43 | <&McMartin> | You're thinking about this wrong. |
| 19:43 | <@Tarinaky> | No, that just gives me the sine theta. |
| 19:44 | <&McMartin> | To do a cross product, just use the formula for it, of which there are many |
| 19:44 | <&McMartin> | The XYZZY mnemonic is pretty good for this except that I never remember how to use it. |
| 19:44 | <@Tarinaky> | I don't want the cross product. I want a decomposition of my velocity with my goal direction as one of the basis |
| 19:45 | <&McMartin> | Oh. |
| 19:45 | <&McMartin> | Hrm. |
| 19:45 | <&McMartin> | I think you actually want a series of dot products for that. |
| 19:45 | <@Tarinaky> | You might be right. |
| 19:45 | <&McMartin> | Dot your direction with the goal direction, note resulting magnitude (dot product is a scalar, so there is no direction) |
| 19:46 | <&McMartin> | Ordering might matter, I'm too frazzled today to remember how that works |
| 19:46 | <@Tarinaky> | Find vector perpendicular to goaql direction |
| 19:46 | <@Tarinaky> | And dot velocity with thaqt to get the complement. |
| 19:47 | | * Tarinaky nods. |
| 19:47 | <@Tarinaky> | Thanks. |
| 19:47 | <&McMartin> | Of course, in threespace there are an infinite number of vectors perpendicular |
| 19:47 | <@Tarinaky> | AQrgh, I broke my keyboaqrd |
| 19:48 | <@Tarinaky> | This is going to maqke finishing this code reaqlly reaqlly interesting :/ |
| 19:48 | <&McMartin> | You're being invaded by the Q Continuum |
| 19:48 | <@Tarinaky> | Lol, even funnier when I hit qqqqqqqqqqqqqqqqqqqqqqqq |
| 19:48 | <@Tarinaky> | Fuck my life. |
| 19:50 | <@ErikMesoy> | How is it broken exactly? Press squarely and sharply in each of the A and Q keys separately, that unjammed my keyboard last time I had similar |
| 19:50 | <@Tarinaky> | wwqtrer dwqmwqge |
| 19:50 | <@Tarinaky> | I spilled satewq everywqhere |
| 19:50 | <&McMartin> | Iä, fhtagn! |
| 19:51 | <@Tarinaky> | Becwqusae I hwqve insaufficient sapwqce to live in :/ |
| 19:51 | <@Alek> | poor taki. |
| 19:51 | <@Alek> | it's spread, I guess. |
| 19:52 | <@Alek> | I'm thinking of force-drying the board with a hairdryer on low, then maybe an isopropyl rinse. |
| 19:52 | <@Alek> | although I don't have any experience, actually. |
| 19:52 | <@Tarinaky> | This is the only spare keyboard I have and it's a fucking nightmare to type on because the keys have no give |
| 19:52 | <@Tarinaky> | Argh |
| 19:53 | <@Tarinaky> | Is this one any better? |
| 19:54 | <&McMartin> | Well, I'm not seeing Qs everywhere |
| 19:54 | <@Tarinaky> | Okay, dug out one of my previously water damaged keyboards to see if this one's fixed from drying out |
| 19:54 | <@Tarinaky> | Much better |
| 19:55 | <@Alek> | if it's that much of a problem, just get a waterproof keyboard and be done with it. |
| 19:56 | <@Tarinaky> | If I had money there is a long list of essentials I'd need to by before I could even consider that :/ |
| 19:56 | <@Tarinaky> | I mean fuck. I'm going to be homeless in a month and a week's time :/ |
| 19:56 | <@Tarinaky> | My dissertation is the least of my problems -.- |
| 19:57 | | * Alek patpats gingerly. |
| 20:04 | | Kindamoody|out is now known as Kindamoody |
| 20:13 | <@Tarinaky> | http://i.imgur.com/F7Ss9f6.jpg << How I feel about the state of my computer keyboards |
| 20:19 | | Kindamoody is now known as Kindamoody[zZz] |
| 20:23 | <@Alek> | also, how you'd like to look? :P |
| 20:24 | <@Tarinaky> | Alek: My hair is nicer than that |
| 20:24 | <@Tarinaky> | Alek: Also, her boobs look smaller than mine :P |
| 20:25 | <@Tarinaky> | McMartin: So, after a break for GoT and dinner... I have reviewed my code. |
| 20:25 | <@Tarinaky> | McMartin: I seems my cross product solution is already semantically identical to finding the perpendicular basis and taking the dot product with that |
| 20:25 | <@Tarinaky> | I'm just checking to make sure |
| 20:26 | <@Tarinaky> | But the product of the gradient of two perpendicular lines is -1, no? |
| 20:31 | <&McMartin> | Remind me how to compute gradients |
| 20:31 | <&McMartin> | The dot product of two perpendicular lines is zero |
| 20:32 | <@Tarinaky> | And m_1 m_2 = -1 |
| 20:32 | <@Tarinaky> | Where m_1 = y_1 / x_1; and m_2 = y_2 / x_2 |
| 20:32 | <&McMartin> | I don't have the cycles for this right now, maybe someone else can weight in |
| 20:33 | <&McMartin> | *weigh |
| 20:38 | <@Alek> | Taki: I dunno, both her hair and her boobs look plenty nice to me. |
| 20:38 | | * Alek shrugs. |
| 20:39 | <@Tarinaky> | Alek: Not the point. |
| 20:39 | <@Tarinaky> | Alek: Mine are nicer. |
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| 21:59 | < Datawalke> | Be back soon! |
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| 23:43 | <@Azash> | https://detroit.craigslist.org/wyn/cpg/4443222965.html |
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| 23:56 | | * Alek facepalms. |
| --- Log closed Tue Apr 29 00:00:50 2014 |