Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: facstd()
PostPosted: Thu Nov 22, 2018 6:43 pm 
When writing facstd() output directly to a file, there is no way to distinguish the various ideals.
Also, I thought that the number of ideals produced by facstd() does not depend on the monomial order. Apparently it does.


Report this post
Top
  
Reply with quote  
 Post subject: Re: facstd()
PostPosted: Sun Nov 25, 2018 4:22 pm 

Joined: Wed May 25, 2005 4:16 pm
Posts: 275
As facstd is a Groebner base computation, it depends on the monomial
ordering. On its way it factorizes (and split) all new elements it came across, so it also depends on the implemented algorithm.
One only knows: the intersection of the ideals is between the radical
of the input and the input itself.


Report this post
Top
 Profile  
Reply with quote  
 Post subject: Re: facstd()
PostPosted: Sun Nov 25, 2018 4:31 pm 

Joined: Wed May 25, 2005 4:16 pm
Posts: 275
To distinguish the ideals in the list of ideal,
use
Code:
write(l,print(list_of_ideals,"%l"));


Report this post
Top
 Profile  
Reply with quote  
 Post subject: Re: facstd()
PostPosted: Wed Nov 28, 2018 11:04 am 
Danke schön. Until now I could tell from the order of variables. Sometimes it is clear from that where one ideal ends and the other begins. Alternatively, I have been printing the output in the shell, where it is obvious.

Best regards.


Report this post
Top
  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

It is currently Fri May 13, 2022 10:56 am
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group