Yes, modular degrees -- I use sympow for that to compute modular
degrees for (almost) every curve in my tables. I could instead use
Magma or revert to using my own installation of sympow, which I used
to do before Sage.... either one of which seems like a step
backwards!
John
On 7 June 2016 at 16:45, William Stein <wst...@gmail.com> wrote:
> Some very useful remarks from Mark...
>
>
> ---------- Forwarded message ----------
> From: Mark Watkins <mark.watk...@sydney.edu.au>
> Date: Tue, Jun 7, 2016 at 11:43 AM
> Subject: Re: proposal: possibly remove Watkins Sympow from Sage
> To: William Stein <wst...@gmail.com>
>
>
> William Stein wrote:
>>
>> Hi,
>>
>> Long ago in 2006, I put Mark Watkins amazing C program "sympow" in Sage:
>>
>> [...]
>>
>> I just tried to use Sympow, since it would be extremely useful for
>> some research I'm doing with Barry
>> Mazur during my visit to Harvard this week. However, it just
>> segfaults in both sage-6.10 **and** sage-7.3.beta.
>> It silently fails when doing the above "not tested" thing, but if you
>> try it at the command line it segfaults:
>>
>> -----
>> (sage-sh) 95d92fa7cb50414ea35d9897eabe44de@compute4-us:sympow$ sympow
>> -new_data 2
>> Make data for symmetric power 2
>> Running the new_data script for -sp 2
>> Making the datafiles for -sp 2
>>
>> Rewarping the param_data file
>> Left with 13 entries in param_data
>> Segmentation fault (core dumped)
>
> The relevant code (in my version) is:
>
> fclose(F); printf("Left with %i entries in param_data\n",i);
> F=fopen("datafiles/param_data","w");
>
> So it likely can't open "datafiles/" for writing.
>
>> I think nothing else in Sage depends on sympow.
>>
>> So... after some discussion, if there is any, I'm going to recommend
>> that we remove sympow. There's no point in building, compiling, and
>> distributing something that doesn't work at all. This just wastes
>> time and maybe makes the release managers life slightly harder.
>
> AFAIK, there were (major) changes made by Sage maintainers over the
> years, firstly I had to help Michael Abshoff even build it (for Suns?)
> back in 2007, and then a number of issues with working directories, etc.
>
> In any event, the principal "application" of sympow was modular degrees,
> and I think Bill Allombert might have something for that in PARI.
>
> For your work with Barry, you could just download
> http://magma.maths.usyd.edu.au/~watkins/sympow.src.tar.bz2
> http://magma.maths.usyd.edu.au/~watkins/sympow.tar.bz2
>
> I am about to leave for Europe in 8 hours, so I can't say that I will
> necessarily be in email contact.
>
> ===
> Mark Watkins
> watk...@maths.usyd.edu.au
>
>
> --
> William (http://wstein.org)
>
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