20120916, 18:43  #78 
May 2008
10001000111_{2} Posts 

20120916, 19:10  #79 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
1110000110101_{2} Posts 

20120916, 20:22  #80 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
1C35_{16} Posts 
Thanks again, that did the trick, although the matrix took quite a bit longer to solve. (50 minutes; though it was actually smaller, it was also about +20 weight/col more dense.)

20120917, 01:42  #81 
Tribal Bullet
Oct 2004
2·3·19·31 Posts 
Nobody is sure, but even with other packages an NFS matrix will become impossible to solve with enough oversieving.

20120917, 01:47  #82 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
1C35_{16} Posts 

20120917, 02:34  #83 
Romulan Interpreter
Jun 2011
Thailand
2×23×199 Posts 
x+y=7
2x+2y=14 3x+3y=21 etc. Solve? 
20120917, 02:46  #84 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3·29·83 Posts 

20120917, 03:37  #85 
Romulan Interpreter
Jun 2011
Thailand
2×23×199 Posts 
Grrr, scrap that! I tried to play smart a$$ before the morning coffee...
Right now I understood what you wanted to say... 
20120917, 05:25  #86 
Nov 2003
2·1,811 Posts 
Has anybody tried to factor 1000+ digit numbers with Yafu? (Of course, sieving methods cannot be used, but Yafu is still better than plain ecm to automate the process, and keep track of found factors.)
The other day I started with 3 numbers with about 1600 digits, everything was working great, and I reached t30 without any problems. Then I switched to numbers with about 10001020 digits, a few of them were all right, then problems began. On one number Yafu crashed with an "unrecognized character on input line" kind of error, on the next one with "too many allocs or frees" error. I'm not sure but it seems it happened when Yafu was about to start ecm. The above was with Yafu1.32.1 on linux (no external ecm), with the same version on Windows7 Yafu crashed on the very first of these numbers (which Yafu on linux was able to process). This is all happening in the batch mode, with "pretest plan custom" and "pretest_ratio" 0.02 or 0.03. BTW, is there a way to tell Yafu to stop ecm on a particular fixed level, say t30, independent of the size of the input number? "preset_ratio" works but it accepts only 2 fractional digits, if I try 0.025 it is converted to 0.03. Even with preset_ratio accepting more fractional digits, an option like "preset_level t30" will be better. Thanks! 
20120917, 10:53  #87 
Tribal Bullet
Oct 2004
3534_{10} Posts 
It isn't that simple; if there are more columns than rows but some of those columns are linear combinations of each other, then you may not have a nontrivial nullspace. My theory is that this is what happens when you have too much oversieving, matrix columns start to look more and more alike because the relations that contribute to them get mixed together too much.

20120917, 13:42  #88  
"Ben"
Feb 2007
3,361 Posts 
Quote:
There is no way that I know of to have yafu stop at a certain tlevel, but I don't think it would be hard to add. Thanks for the feedback. 

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