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Search: Posts Made By: JHansen
Forum: Soap Box 2009-02-11, 12:36
Replies: 27
Views: 1,302
Posted By JHansen
It's probably due to ignorance on most people's...

It's probably due to ignorance on most people's part. I guess the reasoning goes along the lines "Ah, this machine is available for public use, hence it cannot be doing anything important. If...
Forum: Factoring 2008-10-22, 11:16
Replies: 17
Views: 1,438
Posted By JHansen
Read what he wrote, he used Msieve :smile: ...

Read what he wrote, he used Msieve :smile:

PARI is great for general number theory. Factorization is not 'general' number theory though, and specialized tools, such as GMP-ECM, Msieve and GGNFS,...
Forum: Science & Technology 2008-05-13, 11:50
Replies: 85
Views: 4,114
Posted By JHansen
What's up with all the secrecy? The problem is...

What's up with all the secrecy? The problem is certainly interesting, but setting up a problem and then refuse to reveal it's solution after some reasonable amount of time seems very much like the...
Forum: Homework Help 2008-04-25, 21:49
Replies: 33
Views: 3,078
Posted By JHansen
Thumbs down I'd have to agree with Orgasmic Troll on this...

I'd have to agree with Orgasmic Troll on this one. Being pedantic on a subject is instructive and meaningful if doing so enlighten us in some way or draws attention to a problematic selection of...
Forum: Lounge 2008-03-27, 11:59
Replies: 75
Views: 3,091
Posted By JHansen
Copenhagen, Denmark. -- Cheers, Jes

Copenhagen, Denmark.

--
Cheers,
Jes
Forum: Cunningham Tables 2008-03-12, 13:45
Replies: 16
Views: 2,547
Posted By JHansen
I assume the polynomial is X^4+1. Which features...

I assume the polynomial is X^4+1. Which features makes this polynomial especially icky (besides the large norms on the rational side)?

--
Cheers,
Jes
Forum: Factoring 2007-12-21, 05:36
Replies: 20
Views: 2,165
Posted By JHansen
Hmm, I'm still very new to programming, the only...

Hmm, I'm still very new to programming, the only thing I could think of would be that you could possible be missing the .NET framework.

--
Cheers,
Jes
Forum: Factoring 2007-12-20, 21:08
Replies: 20
Views: 2,165
Posted By JHansen
I've started to fiddle a bit with C# programming,...

I've started to fiddle a bit with C# programming, and have now discovered Regular Expressions! :razz:

In order to do something silly, but marginally useful with RegEx'es, I've made a (very!) small...
Forum: Factoring 2007-12-18, 20:16
Replies: 797
Views: 59,684
Posted By JHansen
If you have to cut down a large tree would you...

If you have to cut down a large tree would you use a chain saw or table knife for the job?

If you have made yourself a nice steak for dinner, would you use use a chain saw or a table knife for the...
Forum: Cunningham Tables 2007-12-11, 14:24
Replies: 41
Views: 3,030
Posted By JHansen
If you have a cat, grep and tail available you...

If you have a cat, grep and tail available you can do

cat *.cand | grep e-13 | sort -k 10 | tail

to automagically retrieve the lines containing the ten highest scores.

--
Cheers,
Jes
Forum: Lounge 2007-12-07, 18:00
Replies: 35
Views: 1,485
Posted By JHansen
It says Strøm, not Strom :rolleyes: It's...

It says Strøm, not Strom :rolleyes:

It's probably a compagny name, as the formatting would suggest it's being used as a compagny brand.

--
Cheers,
Jes
Forum: Lounge 2007-11-28, 09:17
Replies: 2
Views: 398
Posted By JHansen
Local network addresses

I was asked today why local network often have addresses that look like 192.168.*.* or 10.*.*.*, and I realized I had no idea why this is the case. :rolleyes:

Why was these chosen as standard...
Forum: Homework Help 2007-11-20, 14:55
Replies: 4
Views: 1,127
Posted By JHansen
It comes from the way the author uses the...

It comes from the way the author uses the Biot-Savart law. Given a vector field V, he looks at the magnetic field BS(V) that would be generated if V was a currentflow.
Forum: Homework Help 2007-11-19, 11:04
Replies: 4
Views: 1,127
Posted By JHansen
Formula split up

I'm doing a paper on the Hodge theorem and as part of this, I'm reading an article that presents the ideas of Hodge decomposition in the special case of domains in R^3 with a smooth boundary.

In...
Forum: Sierpinski/Riesel Base 5 2007-09-08, 15:58
Replies: 83
Views: 5,487
Posted By JHansen
Correct. Not quite. You are making a degree...

Correct.

Not quite. You are making a degree 5 polynomial, not a degree 4. Hence c5=7528 and c0= 5.

You are using M=5^41 as root, as you correctly inferred, thus your linear polynomial is X-M,...
Forum: Lounge 2007-08-10, 12:30
Replies: 55
Poll: 25 replies.
Views: 2,331
Posted By JHansen
public static BitArray Erathostenes(int...

public static BitArray Erathostenes(int maxNumber)
{
BitArray numbers = new BitArray(maxNumber, true);

for (int i = 2; i < maxNumber; i++)
{
...
Forum: Factoring 2007-07-19, 07:07
Replies: 1
Views: 457
Posted By JHansen
http://www.mersenneforum.org/showthread.php?t=6199

http://www.mersenneforum.org/showthread.php?t=6199
Forum: Puzzles 2007-07-03, 07:46
Replies: 16
Views: 6,860
Posted By JHansen
http://mathworld.wolfram.com/Hypersphere.html

http://mathworld.wolfram.com/Hypersphere.html
Forum: Hobbies 2007-05-31, 07:39
Replies: 56
Views: 5,999
Posted By JHansen
Have a look at Matthew Briggs' thesis: ...

Have a look at Matthew Briggs' thesis:

http://scholar.lib.vt.edu/theses/available/etd-32298-93111/unrestricted/etd.pdf

--
Cheers,
Jes
Forum: Msieve 2007-05-21, 13:25
Replies: 244
Views: 6,997
Posted By JHansen
I restarted it and now the memory does indeed...

I restarted it and now the memory does indeed stay low. I have no idea why Task Manager would report the higher value for max mem usage before. :unsure:

--
Cheers,
Jes
Forum: Msieve 2007-05-21, 12:37
Replies: 244
Views: 6,997
Posted By JHansen
Same data - one core only

With only one core the LA took 1hr9mins, with max memory usage at about 232MB.

The dual core LA was 52 mins, max mem usage 417MB.

Mon May 21 12:52:45 2007
Mon May 21 12:52:45 2007
Mon May...
Forum: Msieve 2007-05-21, 10:20
Replies: 244
Views: 6,997
Posted By JHansen
GNFS C120 Benchmark

Relations collected with Franke's siever, rest handled by msieve122alpha. Max mem usage was 418MB, memory usage during squareroot was around 200-240MB.

Mon May 21 10:23:34 2007
Mon May 21...
Forum: Msieve 2007-05-17, 09:45
Replies: 244
Views: 6,997
Posted By JHansen
Segfault

I sieved a C120 with Franke's lattice siever. I get a segfault right as the linear algebra is about to start. I'm using a Windows XP Intel Core2 Duo system, msieve v.1.21.

Thu May 17 10:53:22 2007...
Forum: Miscellaneous Math 2007-05-11, 09:42
Replies: 85
Views: 6,824
Posted By JHansen
http://en.wikipedia.org/wiki/Exterior_derivative...

http://en.wikipedia.org/wiki/Exterior_derivative perhaps?
Forum: Lounge 2007-04-30, 09:05
Replies: 1,048
Views: 62,088
Posted By JHansen
Dilemma

Wondering if any of you can help with my dilemma?

I would be most grateful for any advice you could give on this matter of deep concern to me, as I am now in two minds about what to do.

For...
Showing results 1 to 25 of 116

 
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