| --- Log opened Wed Apr 30 00:00:06 2014 |
| 00:07 | | * Tarinaky is the world's largest derp. |
| 00:24 | | * Tarinaky glares. |
| 00:24 | <@Tarinaky> | For some reason getline is consistently getting exactly 0 characters. |
| 00:25 | <@Tarinaky> | Constantly. |
| 00:40 | | You're now known as TheWatcher[T-2] |
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| 12:46 | | * Tarinaky blinks at gdb for being obtuse. |
| 12:49 | <@Tarinaky> | For some reason, specifying arguments as part of the 'run' command doesn't work. |
| 12:49 | <@Tarinaky> | :/ |
| 12:49 | <@Tarinaky> | Ooooh! |
| 12:49 | <@Tarinaky> | Derp |
| 12:50 | < McMartin> | Derp aside, that still counts as obtuse on gdb's part. |
| 12:51 | <@Tamber> | gdb is made of obtuse, no? |
| 12:51 | <@Tarinaky> | Apparently, it wasn't handling the escaping of the space in the first argument's name (it was a file) |
| 12:53 | <@Tarinaky> | So instead of foo foo\ bar bar being split into {"foo", "foo\ bar", "bar"} it was splitting that up into {"foo", "foo\", "bar", "bar"} |
| 12:53 | <@Tarinaky> | If that makes any sense. |
| 12:56 | < RobinStamer> | Blegh |
| 12:56 | < RobinStamer> | That's BR worthy at least |
| 12:57 | | RobinStamer is now known as [R] |
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| 13:07 | <@Tarinaky> | C++ question: |
| 13:08 | <@Tarinaky> | What are the causes for a float becoming inf |
| 13:08 | <@Tarinaky> | And what are the cuases for a float becoming NaN |
| 13:08 | <@Tamber> | It's sprung a leak. |
| 13:08 | <@Tamber> | It has become a sink. |
| 13:08 | <@Tarinaky> | and by causes I mean operations. |
| 13:08 | <@Azash> | I guess division by zero and sqrt'ing a negative number would be examples respectively |
| 13:09 | < [R]> | Also both Inf and NaN are infectious. |
| 13:09 | | * Tarinaky nods. |
| 13:10 | <@Tarinaky> | I'm just looking for clues to help me debug. |
| 13:10 | < [R]> | Though I think NaN has higher priority. |
| 13:11 | <@Azash> | That would make sense |
| 13:11 | <@Azash> | Considering inf is "you done goofed" and NaN is "okay you really done goofed" |
| 13:13 | < [R]> | Pretty sure atof's and/or it's replacement returns NaN when the string isn't a number. |
| 13:15 | <@TheWatcher> | Nope |
| 13:16 | <@TheWatcher> | double foo = atof("foo"); printf("%f", foo); will print "0.000000" |
| 13:17 | <@Tarinaky> | I'm not sure atof has a standard definition |
| 13:17 | <@Tarinaky> | Because that sounds suspiciously straight forward. |
| 13:17 | <@TheWatcher> | (Also, obligatory Array(16).join("wat" - 1) + " Batman!") |
| 13:18 | <@Azash> | "If no valid conversion could be performed, the function returns zero (0.0)." |
| 13:18 | <@Azash> | "If the converted value would be out of the range of representable values by a double, it causes undefined behavior." |
| 13:18 | <@Azash> | I think if the converted value would be out of range of a double's representable values you have some bigger problems than undefined behaviour |
| 13:20 | | * Tarinaky blinks at something that doesn't make a whole lot of sense. |
| 13:20 | <@TheWatcher> | (also, I note you should really be using strtod() rather than atof(), as the former lets you do error checking, while the latter will behave as Azash said and you can't tell that) |
| 13:22 | | * Azash wonders who on earth would have a string representing 3.5953862697246314162905484746340871359614113505... Ã 10^308 |
| 13:23 | <@TheWatcher> | Astrophysicists? |
| 13:23 | <@Azash> | I thought they generally use specialized libs for scientific computation |
| 13:24 | <@Azash> | Plus I doubt astrophysicists mess around with strings too much |
| 13:24 | | * Azash straight face |
| 13:24 | <@Tarinaky> | Azash: CSV |
| 13:24 | <@TheWatcher> | I will be over here, making no comment whatsoever |
| 13:25 | <@Tarinaky> | It's quite common for catalogues and databases to be exportable as CSV since, as we pointed out yesterday, it's super-easy to tokenise. |
| 13:25 | <@Tarinaky> | And whatever file format you're reading in from disk, it's probably a string. >.> |
| 13:25 | <@Azash> | Sure, but if it's from a CSV, it has been put into the CSV from somewhere |
| 13:26 | <@Azash> | Meaning it's either going to be something a double can represent, or it will be imported by one of said scientific computing tools and not actually get put into a double form |
| 13:27 | <@Tarinaky> | Or someone just typed it in as a string. |
| 13:27 | <@Tarinaky> | It's easy to specify numbers bigger then 1e307 |
| 13:27 | <@Azash> | Tarinaky: Also, the note on astrophysicists not working with strings was a joke that was deliberately left unpronounced |
| 13:27 | <@Tarinaky> | 1e400! There, I just did it :P |
| 13:27 | <@Tarinaky> | Oh. Okay |
| 13:27 | <@Tarinaky> | I'll stop procrastinating and get back to the big fixing then |
| 13:28 | | * Azash feels today is not productive, just heads home |
| 13:28 | | * Tarinaky blinks at this method. |
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| 14:00 | < [R]> | Tarinaky: RE the "as a string" thing, you know you can dump the raw binary data onto the disk right? |
| 14:01 | < [R]> | So the number 0x30303030 would be the same as "0000" (without the NUL). |
| 14:01 | <@Tarinaky> | [R]: Yes, but this is bad practice. |
| 14:02 | < [R]> | 808464432 |
| 14:02 | < [R]> | By "bad practice" you mean "what every database does" |
| 14:02 | <@Tarinaky> | I rest my case. |
| 14:02 | < [R]> | It's also only "bad practice" if you don't know how to deal with endianess. |
| 14:03 | < [R]> | Eitherway, I've got to leave for work now. |
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| 14:13 | <@Azash> | Tarinaky: Paid by the hour |
| 14:15 | <@Tarinaky> | Azash: ? |
| 14:16 | <@Tarinaky> | I was blinking at my code. Not you leaving. |
| 14:16 | <@Azash> | Oh |
| 14:17 | <@Tarinaky> | TL;DR - code replication was causing unexpected behavior because a necessary method wasn't getting called to initialise certain values. |
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| 15:16 | | * Tarinaky yays. |
| 15:16 | <@Tarinaky> | I can call "fuck it that'll do" on the code portion. |
| 15:16 | <@Tarinaky> | Now I just need to write up :/ |
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| 20:50 | < McMartin> | Hooray, the amazing Wince-O-Tron confirmed to work on actual hardware. |
| 20:51 | < McMartin> | Also, the weird behavior I saw in VICE is *also* confirmed on actual hardware, which is baffling and now I have no idea what the VIC-II is doing there |
| 20:51 | < McMartin> | Possibly even the authors of VICE do not! IIRC the VIC-II emulation is at the gate level so they might just be saying "hey, we just implemented the logic functions." |
| 20:54 | < McMartin> | https://hkn.eecs.berkeley.edu/~mcmartin/retro/cc3_3.png <-- The amazing Wince-O-Tron. Those colorbars also scroll up, forever, while you are doing other things on the system. |
| 20:55 | <@ErikMesoy> | Doesn't load for me. |
| 20:55 | <@Tamber> | It's amazingly eye-searing. |
| 20:55 | <@Tamber> | ;) |
| 20:56 | <@Tamber> | Or, at the very least, mercilessly distracting if you're trying to do other things. |
| 20:56 | < McMartin> | https://hkn.eecs.berkeley.edu/~mcmartin/retro/colorchart3.html maybe? |
| 20:56 | < McMartin> | It's less distracting than the non-animated one, hilariously, because *that* one is basically guaranteed to hide one out of every 15 lines. |
| 20:57 | <@Tamber> | Hee |
| 20:58 | <@ErikMesoy> | whaaaaaat |
| 20:58 | <@ErikMesoy> | what is this |
| 20:58 | <@ErikMesoy> | Wince-O-Tron sounds about right |
| 20:59 | < McMartin> | It's me pushing the C64's semi-documented splitscreen capability as far as I can by making it reliably trigger every 8 lines. |
| 20:59 | < McMartin> | But also making it trigger a different 8 lines every frame. :D |
| 20:59 | < McMartin> | Er. A different every 8 lines, rather. |
| 21:00 | | * McMartin had found a colorchart demo program from '83 and while he was ripping it apart discovered a better way to do it, and then took that way up to 12. |
| 21:00 | <@Tamber> | =) |
| 21:02 | < McMartin> | While doing that I *also* found that if I messed up the timing, sometimes I'd get whole-line flicker and sometimes I'd get tearing like the horizontal hold was wrong. |
| 21:02 | < McMartin> | I kind of figured that the latter was correct emulation and former was it taking shortcuts turning what should have been tearing into a whole line of color instead (and thus flicker) but that effect has just been confirmed on actual hardware |
| 21:02 | | * Tamber fires up the wince-o-tron |
| 21:02 | < McMartin> | So I dunno wtf, but it's right |
| 21:02 | | * Tamber attempts to type. Winces. |
| 21:03 | < McMartin> | I find that setting the text color to white helps (Ctrl-2, which is actually Tab-2 in VICE by default) |
| 21:03 | <@Tamber> | Ah, much better! |
| 21:03 | < McMartin> | The programs on that disk can't really coexist while running, so you'll have to run-stop/restore out of it before running other stuff off that disk. |
| 21:04 | < McMartin> | (Which is ESC/PgUp and they somehow managed to emulate the part where you have to keep slamming the PgUp key for it to work) |
| 21:04 | <@Tamber> | Hee |
| 21:06 | < McMartin> | The RESTORE key was apparently wired directly to the non-maskable interrupt pin of the CPU |
| 21:07 | | Kindamoody is now known as Kindamoody[zZz] |
| 21:08 | < McMartin> | (The whole-screen flashing whenever you hit a key is because the keyboard interrupt usurps the graphics timer and by the time it finishes processing the key, it's missed its cue and doesn't fire until the next frame) |
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| 22:38 | | * TheWatcher scratches his head over implementing weighted random selection from a vector |
| 22:45 | <~Vornicus> | thresholds = [sum(probabilities[0:k+1]) for k in range(len(probabilities))]; bisect that on the random number in the interval [0, thresholds[-1]) to find the result. |
| 22:46 | | * TheWatcher nod |
| 22:47 | <@TheWatcher> | I note this is a std::vector in c++, but I get your point. |
| 22:49 | <~Vornicus> | You will need to, at the very least, sum the weights to determine what range your random variable needs |
| 22:49 | <~Vornicus> | (the thresholds list makes subsequent sampling calls be O(log n) instead of O(n), but costs you memory, of course) |
| 22:53 | <@TheWatcher> | Aye, memory isn't really an issue in this case - there's only going to be maybe 30 items at most in the list. |
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| 23:05 | <~Vornicus> | at that size even bisect has not that great performance |
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| --- Log closed Thu May 01 00:00:22 2014 |