I'm not really sure what you mean with this. Could you go into more detail with what you're asking about?Duality wrote:I'd love to see more examples of how this works -- there's not a whole lot out on the net that explains it very well

## Search found 179 matches

- Mon Nov 14, 2011 10:16 pm
- Forum: Number
- Topic: Chinese remainder theorem with exponents
- Replies:
**1** - Views:
**3479**

### Re: Chinese remainder theorem with exponents

- Wed Nov 09, 2011 10:30 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 356
- Replies:
**17** - Views:
**6761**

### Re: Problem 356

I could kiss you right now. I'm as blind & dumb as a bat, I swear to god. I have no idea how I missed behavior that obvious! I'll have it solved shortly!sivakd wrote:I am hoping this is not going to give out much. For me, the research I did to solve problem 318 helped in solving this.

- Tue Nov 08, 2011 7:19 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 356
- Replies:
**17** - Views:
**6761**

### Re: Problem 356

So, I've been completely unsuccessfully ramming my head against this problem for weeks now and I'm curious about one thing: Is the typical method of solution specific to the nature of the root of a cubic? Or could you come up with a method to solve (for instance) $ \lfloor1.1^a\rfloor (mod \; b) $ a...

- Sun Oct 09, 2011 11:26 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 352
- Replies:
**35** - Views:
**11026**

### Re: Problem 352

Thank you :) the second case is what threw me off ... there's actually a direct formula for calculating it. Sorry for the stupid question though, but what do you mean by "it"? The expected value? Posterior probability of any single one being infected? I have a formula, too. It's just got capital si...

- Sun Oct 09, 2011 5:50 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 352
- Replies:
**35** - Views:
**11026**

### Re: Problem 352

My thinking goes I only need to take care of two possibilities: 1 - Where we don't know if any are infected *uniform* 2 - Where we know at least one is infected The first case is straight forward, but for the second case I literally go through all the possibilities: WhatIfOneIsInfected * ChanceOnly...

- Fri Oct 07, 2011 12:06 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 352
- Replies:
**35** - Views:
**11026**

### Re: Problem 352

Well this is fun. First problem I've sat down to tackle in a while and I've got a great algorithm going that I know is correct (both T(25,0.02) and T(25,0.10) are spot on the nose, and tactically it makes perfect sense). The only problem is that when I do the full problem, I get an invalid answer. W...

- Thu Jun 09, 2011 3:36 pm
- Forum: Recreational
- Topic: Suggested Careers that involve PE type thinking
- Replies:
**2** - Views:
**3349**

### Re: Suggested Careers that involve PE type thinking

Well, I work at a company that creates image processing software (specifically the recognition section of the company, i.e. OCR, ICR, Barcode, etc). I can say with authority that the tricks & algorithms I've learned throughout PE have given me a big boost in coming up with top-of-the-line techniques...

- Thu Jun 09, 2011 3:30 pm
- Forum: News, Suggestions, and FAQ
- Topic: Are all new problems difficult ones?
- Replies:
**6** - Views:
**3182**

### Re: Are all new problems difficult ones?

Yeah, it's very much a sliding metric of difficulty. Things that might have been considered 'hard' back in the earlier problems are easy compared to the later problems. It's mainly that doing all of these problems trains you in techniques & problem solving, so something that would have been hard bef...

- Thu Jun 02, 2011 3:45 pm
- Forum: News, Suggestions, and FAQ
- Topic: Only a small critique
- Replies:
**2** - Views:
**1353**

### Re: Only a small critique

You're not exactly narrowing down that field... which particular graphic is poor? All of them? General web design?

- Sun May 29, 2011 5:10 pm
- Forum: News, Suggestions, and FAQ
- Topic: Spurious Incorrect Confirmation Code error?
- Replies:
**4** - Views:
**2070**

### Re: Spurious Incorrect Confirmation Code error?

Protip -- click the number box to have it auto-refresh without having to reload the page. I always do that before submitting an answer.

- Tue May 24, 2011 3:20 pm
- Forum: Programming languages
- Topic: PHP is too powerless for PE?
- Replies:
**11** - Views:
**7767**

### Re: PHP is too powerless for PE?

The brute force approach will work for some of the earlier problems; god knows it helped me more than once when I was beginning this site & didn't understand a lot of the more advanced mathematical / algorithmic methods one can use in later problems. You'll find that the numbers for the later proble...

- Sun May 22, 2011 4:14 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 339
- Replies:
**27** - Views:
**6863**

### Re: Problem 339

Doh, I came here for the exact same reason. I have no idea how I passed over the opposite color distinction, even though I'd read the passage twice. Selective blindness I suppose.

- Sat May 21, 2011 4:58 am
- Forum: Programming languages
- Topic: Python 3 IDE
- Replies:
**8** - Views:
**8515**

### Re: Python 3 IDE

Hello all, I currently use PyScripter IDE for coding in Python 2 and 3 in Windows, but I also use Ubuntu, in which I only use DrPython to code only Python 2. I was wondering if anyone knows any lightweight Python 3 IDEs for Ubuntu. All I really want is customisable syntax highlighting and an inbuil...

- Tue May 10, 2011 2:43 am
- Forum: Applied Mathematics
- Topic: Absorbing Markov chains... how do they work?
- Replies:
**1** - Views:
**7188**

### Re: Absorbing Markov chains... how do they work?

AHAH! I think I figured it out! if $ N = (I-Q)^{-1} $, the correct values are $ \frac { N^2R } { NR } $, where it's element-wise division of the upper & lower matrices. Derivation: Given a transition matrix $ M = \left[ \begin{array}{cc} Q & R \\ 0 & I \end{array} \right] $ Expected value is: $ E[X]...

- Tue May 10, 2011 1:40 am
- Forum: Applied Mathematics
- Topic: Absorbing Markov chains... how do they work?
- Replies:
**1** - Views:
**7188**

### Absorbing Markov chains... how do they work?

So I've used Markov chains plenty before, but only in the case of one absorbing state. I was playing around with a super simple example of a random walk, and I got really confused by the results. The simple random walk is: [x] <- [a] <-> -> [y] with equal probabilities in each direction. In canonica...

- Fri Jan 21, 2011 6:39 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 319
- Replies:
**23** - Views:
**7424**

### Re: Problem 319

This is incorrect -- you're very close though. ....3243.quintana wrote:could t(30) possibly end up with ...9113247?

thanks!

- Thu Jun 10, 2010 1:30 am
- Forum: News, Suggestions, and FAQ
- Topic: integer limits and 1 minute rule
- Replies:
**5** - Views:
**1747**

### Re: integer limits and 1 minute rule

Thanks again. I just checked with the IT Manager. It is most likely my computer is a 32-bit integer machine. It's not that; many/most languages feature 64-bit data types even on 32-bit integer machines. VBA on the other hand, only really has the Currency type that's 64-bit and the Decimal type that...

- Thu Jun 10, 2010 12:47 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 280
- Replies:
**9** - Views:
**3452**

### Re: Problem 280

Ok, so I think I've got a handle on the maths required for this, but my very very simple brute force simulation is producing some odd values. So, starting from the middle square: 00000 00000 00X00 00000 11111 would the actual expected value of the number of turns it takes to reach the N'th item on t...

- Thu Jun 03, 2010 12:15 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 059
- Replies:
**93** - Views:
**20993**

### Re: Problem 059

I'm not sure if I understand corectly. The cipher text is made of symbols C1, C2, ..... Cn. (in this case n=1201) The original text is made of symbols O1, O2, ..... On. The password is made only of 3 symbols, namely S1, S2 and S3. And the original text must be made by these formulae O1=C1xorS1 ; O2...

- Wed May 19, 2010 1:39 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 258
- Replies:
**22** - Views:
**6940**

### Re: Problem 258

I do have the same problem that quilan had: I solved the problem (in very LONG runtime) and gained access to the forum, but I have no idea, why the method i.e. of the first post is working. Could some kindly soul PM me some hints for further reading? I'll send some info once I get into work this mo...