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code logs -> 2008 -> Sun, 02 Nov 2008< code.20081101.log - code.20081103.log >
--- Log opened Sun Nov 02 00:00:50 2008
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19:56
<@gnolam>
http://pics.nase-bohren.de/progress-bar.jpg
19:58
<@AnnoDomini>
Seen it. It's still awesome, though.
19:59
<@gnolam>
It reminds me to redouble my efforts to convert the local student pub into a jihad-themed pub called "Allahu AqBar & Grill".
20:22
<@AnnoDomini>
That's a nasty pun.
20:25
<@gnolam>
Today's special: salami aleikum.
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20:39
<@AnnoDomini>
gnolam: http://pics.nase-bohren.de/turist.jpg <- This from Poland?
20:52
<@gnolam>
You tell me.
20:53
<@AnnoDomini>
The phonetics look like Polish.
21:06 Vornicus is now known as Finerty
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22:28
<@Consul>
Do I have to register with Project Euler to get to the answers?
22:30
< Finerty>
You don't see the answer until you solve the problem; I think you need to register to do that.
22:30
< Finerty>
to put that you've solved it, that is
22:31
<@Consul>
I won't know if I have until I know the answer, though.
22:32
< Finerty>
Register, type in your suspected answer, and it will tell you if you're right or not.
22:32
< Finerty>
There is, as far as I'm aware, no penalty for a wrong answer... but what problem is it?
22:32
<@Consul>
The first one.
22:32
<@Consul>
I'm just using PE for learning Python/.
22:33
< Finerty>
Okay. PM me your answer and I'll tell you if you've got it.
22:33
<@Consul>
So for me, getting the right answer is more for "okay, I got the language right" then "okay, I solved that problem right".
22:33
<@Consul>
I just registered.
22:33 * Finerty also stoatloafs Chalcy.
22:34
<@Consul>
I also got it wrong, so I guess I need to check those references again./
22:34
< Finerty>
what was your answer?
22:35
<@GeekSoldier>
if you get it wrong, it tells you. If you get about 5 incorrect responses on the same question within a few minutes, it freezes the question for a while.
22:35
<@GeekSoldier>
To avoid brute forcing, I suppose.
22:35
<@Consul>
I'm guessing I constructed my if statement incorrectly.
22:36
< Finerty>
Are you accidentally double counting multiples of 15? are you including 1000? Both of those are wrong
22:37
<@Consul>
Ooh, good point on that first one...
22:38
<@Consul>
No, it shouldn't be double-counting numbers divisible by both...
22:39
< Finerty>
pastebin your code. You're talking to at least one person who is an Expert at python.
22:39
<@GeekSoldier>
At least one expert and one proficient dabbler.
22:40 mode/#code [+o Finerty] by GeekSoldier
22:40
<@Consul>
Well, I guess the whole point is to learn Python... I'm going to try a few more things here really quick...
22:40 mode/#code [+oo Chalcedon crem_] by Finerty
22:41 * GeekSoldier searches for an HP 50G.
22:45
<@Finerty>
and at that number theory.
22:46
<@Consul>
Okay, it wants all numbers that are multiples of 3 or 5 up to 1000 summed, right?
22:46
<@Finerty>
Right.
22:47
<@Finerty>
Not including 1000
22:48
<@Consul>
http://rafb.net/p/tJCL9s20.html -- I'm sure I'm about to really embarrass myself, but hey...
22:48
<@Finerty>
that's how I'd do it. odd that it's not working.
22:48
<@GeekSoldier>
it's counting multiples of 15 twice.
22:49
<@Finerty>
No it's not
22:49
<@Consul>
I get 233168 as the answer.
22:49
<@Finerty>
That's the right answer.
22:49
<@GeekSoldier>
Correct.
22:49
<@GeekSoldier>
I see.
22:49
<@Consul>
PE disagreed.
22:49
<@Finerty>
that's odd.
22:50
<@Consul>
Just out of curiosity, is there a better algorithm?
22:50
<@GeekSoldier>
It is correct...
22:50
<@Finerty>
Consul: there's a way of doing it without any code...
22:50
<@Consul>
Huh? Doesn't that defeat the purpose of the exercise?
22:51
<@GeekSoldier>
not really. there are plenty of submissions that were done on paper.
22:51
<@Finerty>
Indeed, a good many of these I could do without code.
22:52
<@Consul>
Oh, hey...
22:52
<@Consul>
I included 1000 by accident the first time.
22:52
<@Consul>
It accepted it now.
22:53
<@GeekSoldier>
Man, I miss calculators with RPN.
22:53
<@Finerty>
I wouldn't necessarily want to, but I could. This one, it's (3 + 5 + 6 + 9 + 10 + 12 + 15) * 66 + 7 * 15 * triangle(65) + 993 + 995 + 996 + 999
22:56
<@GeekSoldier>
heh, wow.
22:56
<@GeekSoldier>
I'll stick with the Python or J solution.
22:57
<@Consul>
Ooh, now I get to come up with a slick Fibonacci function. :-)
22:57
<@McMartin>
Problem. You wrote 'The long of longcat is long' : but that is a very peculiar property value, and ought to be something more definite and explicit.
22:57
<@GeekSoldier>
Damn, I need to bring my server up so that I can access all my old PE files.
22:59
<@Consul>
Can Python do recursive functions?
23:00
<@Finerty>
Consul: yes.
23:00
<@Consul>
Cool, thanks.
23:01
<@Finerty>
print sum(k for k in xrange(1000) if k % 3 == 0 or k % 5 == 0) # this by the way is my solution to number 1.
23:02
<@GeekSoldier>
that's about what I had, too.
23:02
<@Finerty>
mmm-mm-mmm, generators are tasty.
23:02
<@Consul>
Ooh, see, that's handy language stuff I'd like to know.
23:04
<@Consul>
okay, does problem 2 not want the sum to exceed 4 million, or the final number of the sequence being summed to not exceed that?
23:04
<@GeekSoldier>
the latter.
23:04
<@Consul>
Okay, thanks
23:04
<@Consul>
This is gonna be a huge number.
23:04
<@Finerty>
No it's not.
23:05
<@Finerty>
If you're using a non-memoized recursive function though it will be a pain.
23:05
<@GeekSoldier>
think about how rapidly the fib sequence gets larger.
23:05
<@Consul>
Well, not "current national debt" huge, but not small.
23:06
<@Consul>
Hrm, good point.
23:06
<@McMartin>
Geek: Exponential.
23:06
<@McMartin>
O(2^n).
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23:10
<@EvilDarkLord>
I occasionally see files stored in paths like /media/images/1000000/10003000/10003721.gif . Is this necessary for performance in modern file systems?
23:10
<@Finerty>
EvilDarkLord: File systems can be slow at finding files in very popular directories.
23:11
<@EvilDarkLord>
Finerty: Okay. What causes this?
23:13
<@Finerty>
For each file you have to examine the directory's node, then hunt up the node for each file from there, open it up, examine the title, close the node...
23:14
<@gnolam>
Shouldn't be an issue in any kind of modern file system.
23:14
<@gnolam>
Hashing, etc.
23:15
<@gnolam>
It'll make /listing all the files/ within slow though.
23:17
<@Finerty>
Or doing any globbing.
23:17
<@EvilDarkLord>
Err, globbing?
23:17
<@Finerty>
globbing: use of * and ? and others to list multiple files that match certain patterns
23:18
<@Finerty>
From another channel: <ToxicFrog> '*' is anything, '?' is any one character. Thus 'cp *.gm /foo' will copy all files ending in '.gm' in the current directory, and 'cp ???.gm /foo' copies only those with exactly three characters before the extension.
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23:23
<@ToxicFrog>
EvilDarkLord: generally, when I see filenames like that, they're from a camera or whatever doing autogenerated names
23:25
<@EvilDarkLord>
The only thing I intend to use these file names for is one-at-a-time image display on a media server. Does it offer any significant benefit to use small directories in a case like that?
23:28
<@EvilDarkLord>
The assumption is that there will be about 500,000 different directories all told.
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23:33
<@ToxicFrog>
That's rather a lot.
23:35
<@EvilDarkLord>
This is true. If you think I'm Doing It Wrong, I'd be very happy to take advice.
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23:44
<@ToxicFrog>
I have no idea. I'm not sure if that actually is a lot.
23:44
<@ToxicFrog>
It's not something I've looked into before.
23:44
<@McMartin>
Efficiency is nothing until you can prove you don't have it, etc.
23:45
<@McMartin>
I'd say give it a shot and see how it goes
23:45
<@McMartin>
If it gets slow, fabbing directories out of the synthetic filenames should be very easy.
23:51
<@McMartin>
There. Lolbugs: http://www.stanford.edu/~mcmartin/misc/lolbugs.txt
--- Log closed Mon Nov 03 00:00:02 2008
code logs -> 2008 -> Sun, 02 Nov 2008< code.20081101.log - code.20081103.log >
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