Why does it do only one curve?

Andi47 · 2006-03-18, 05:31

I have installed msys and gmp-ecm as described in the readme file and tried to do some curves on the C205 - entered this line:

ecm -c 372 1e6 <1701-c205 >1701-c205-1M.out

I intended to get 372 curves, but I got only one. What did I do wrong?

Andi47 · 2006-03-18, 17:52

Anyone help me how to get more than one curve?

Mystwalker · 2006-03-18, 18:11

I just tried to retrace your problems. The only scenario I got such a behavior was when a factor has been found and the co-factor is probable prime.

Could you post your output file, please?

Andi47 · 2006-03-18, 19:24

Here it is - I renamed it to .txt for uploading.

I see no factor in this file - it only gives the time steps one and two took.

Mystwalker · 2006-03-18, 21:23

Unfortunately, I wasn't able to reproduce your problem. I tried the same number with the same command line, but it worked for me.

I could think of two more problem sources:
1. Maybe there is something wrong with input/output. Just enter the number at command line ("echo <number> | ecm <...>") and don't redirect the output to a file.

2. Maybe your ecm file is somehow corrupt. Try recompiling it or take a suitable binary from this thread.

Hope this helps!

axn · 2006-03-18, 22:28

If the input file doesn't have a terminating newline character after the number, gmp-ecm will quit after the first curve. Just add a newline to your input file and you should be ok.

Andi47 · 2006-03-19, 06:38

Quote:

Originally Posted by axn1

If the input file doesn't have a terminating newline character after the number, gmp-ecm will quit after the first curve. Just add a newline to your input file and you should be ok.

Thanks. Now added the newline char, it works.

2006-03-18, 05:31	#1
Andi47 Oct 2004 Austria 2·17·73 Posts	Why does it do only one curve? I have installed msys and gmp-ecm as described in the readme file and tried to do some curves on the C205 - entered this line: ecm -c 372 1e6 <1701-c205 >1701-c205-1M.out I intended to get 372 curves, but I got only one. What did I do wrong?

2006-03-18, 22:28	#6
axn Jun 2003 4840₁₀ Posts	If the input file doesn't have a terminating newline character after the number, gmp-ecm will quit after the first curve. Just add a newline to your input file and you should be ok. Last fiddled with by axn on 2006-03-18 at 22:28

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Elliptic Curve Arithmetic	Raman	Math	8	2009-04-13 19:20
Lucky gmp-ecm curve...	WraithX	GMP-ECM	4	2009-01-12 16:29
Work Per ECM Curve	wblipp	GMP-ECM	8	2008-12-28 14:24
Elliptic curve method	Dirac	Factoring	11	2007-11-01 14:01
Curve Counts	Prime95	Factoring	23	2005-03-22 16:43

2006-03-18, 17:52	#2
Andi47 Oct 2004 Austria 2×17×73 Posts	Anyone help me how to get more than one curve?

2006-03-18, 18:11	#3
Mystwalker Jul 2004 Potsdam, Germany 3×277 Posts	I just tried to retrace your problems. The only scenario I got such a behavior was when a factor has been found and the co-factor is probable prime. Could you post your output file, please?

2006-03-18, 21:23	#5
Mystwalker Jul 2004 Potsdam, Germany 3·277 Posts	Unfortunately, I wasn't able to reproduce your problem. I tried the same number with the same command line, but it worked for me. I could think of two more problem sources: 1. Maybe there is something wrong with input/output. Just enter the number at command line ("echo <number> \| ecm <...>") and don't redirect the output to a file. 2. Maybe your ecm file is somehow corrupt. Try recompiling it or take a suitable binary from this thread. Hope this helps!