Re: [sage-support] using s_integral_points to get the rank of an elliptic curve
Thank you very much for your explanation and the kind help. With best regards, Petra Tadic On Thursday, March 27, 2014 9:08:26 PM UTC+1, John Cremona wrote: On 27 March 2014 18:04, pau...@gmail.com javascript: wrote: Thank you very much for your kind help. It is a honor to get the question answered by you. Does the MAGMA command SIntegralPoints miss points also? You would have to ask the Magma people about that, but the implementations are entirely independent. When we (I and a couple of Masters students) first implemented integral and S-integral points in Sage (over Q only) in 2008, we did find points which Magma missed, but since then both implementations have had improvements, to the extent that Steve Donnelly (Magma) now uses a lot of tricks which are not published. It is taking me longer than I expected to review a long-lived patch on the trac server which translates an implementation by another student of mine of integral points over number fields (not S-integral points yet) from its original Magma form to Sage; there are some good reasons for this, as some of the published formulas are wrong! Your enquiry gives me motivation to get back to that project which has been lying neglected since term started in January! John With best regards, Petra Tadic On Thursday, March 27, 2014 6:21:24 PM UTC+1, John Cremona wrote: If the rank is successfully computed then it will be cached so calling E.rank() afterwards will just retriueve the value with no further computing. ALternatively, compute the rank first, then the S-integral points computation will need not re-do it. I should tell you , though, that there are examples where some S-integral points are missed and it is a rather long-delayed project of mine to correct that; I am first working on the (separate) integral points code, and after that will look again at the S-integral points. So you should probably not rely on the outpus to prove any theorems just yet. John On 27 March 2014 17:06, pau...@gmail.com wrote: I am using the command s_integral points for a lot of elliptic curves for calculating S-integral points of elliptic curves over Q. I know that the command s_integral_points in it's calculation calculates also the rank of the elliptic curve in question but doesn't output the result. How can I get the value of the rank without calculating it separatly again with another command for the rank. So I'd like to get the rank and the S-integral points all at once with the one s_integral_points command. Thank you for the help. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support...@googlegroups.com. To post to this group, send email to sage-s...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support...@googlegroups.com javascript:. To post to this group, send email to sage-s...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] write with for loop not working when using nohup
I am using sage 5.9. When I use program1.sage below written with nohup like:
nohup /opt/sage5.9/sage program1.sage
it doesn't write nothing I want in the file program1.out. But program2.sage
writes what I want in program2.out. It seems that nohup with for loop and
command write don't work together like for example in program1.sage, but
without the for loop it works fine like in the program2.sage.
==
program1.sage
==
f=open('/home/petrat/program1.out','a')
i=1
for i in [1..10]:
f.write(str(i))
f.close()
==
program2.sage
==
f=open('/home/petrat/program2.out','a')
f.write('working')
f.close()
--
You received this message because you are subscribed to the Google Groups
sage-support group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-support+unsubscr...@googlegroups.com.
To post to this group, send email to sage-support@googlegroups.com.
Visit this group at http://groups.google.com/group/sage-support.
For more options, visit https://groups.google.com/d/optout.
[sage-support] using s_integral_points to get the rank of an elliptic curve
I am using the command s_integral points for a lot of elliptic curves for calculating S-integral points of elliptic curves over Q. I know that the command s_integral_points in it's calculation calculates also the rank of the elliptic curve in question but doesn't output the result. How can I get the value of the rank without calculating it separatly again with another command for the rank. So I'd like to get the rank and the S-integral points all at once with the one s_integral_points command. Thank you for the help. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] using s_integral_points to get the rank of an elliptic curve
Thank you very much for your kind help. It is a honor to get the question answered by you. Does the MAGMA command SIntegralPoints miss points also? With best regards, Petra Tadic On Thursday, March 27, 2014 6:21:24 PM UTC+1, John Cremona wrote: If the rank is successfully computed then it will be cached so calling E.rank() afterwards will just retriueve the value with no further computing. ALternatively, compute the rank first, then the S-integral points computation will need not re-do it. I should tell you , though, that there are examples where some S-integral points are missed and it is a rather long-delayed project of mine to correct that; I am first working on the (separate) integral points code, and after that will look again at the S-integral points. So you should probably not rely on the outpus to prove any theorems just yet. John On 27 March 2014 17:06, pau...@gmail.com javascript: wrote: I am using the command s_integral points for a lot of elliptic curves for calculating S-integral points of elliptic curves over Q. I know that the command s_integral_points in it's calculation calculates also the rank of the elliptic curve in question but doesn't output the result. How can I get the value of the rank without calculating it separatly again with another command for the rank. So I'd like to get the rank and the S-integral points all at once with the one s_integral_points command. Thank you for the help. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support...@googlegroups.com javascript:. To post to this group, send email to sage-s...@googlegroups.comjavascript:. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups sage-support group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
