Here's a previous post on the forum about this subject.
http://www.gap-system.org/ForumArchive/Index/Subject/F.html#factors_of_a_permutation_cycle
Don King wrote:
Thanks for all who helped me with this issue. I used a
"Sortex(<list>)" method, and now it seems everything is working fine.
I am wondering if only outputs with transposes are also possible with
"Sortex" method.
For instance,
<<Permutation Notation>>
[1,3,2,4]
[2,4,1,3]
...........
The output of a "Sortex" method
<<Cycle Notation>>
(2,3)
(1, 2, 4, 3)
.......
The (desired) output of only transposes
<<Transopose Notation>>
(2,3)
(1,3)(1,4)(1,2)
Many thanks
Don
------------------------------------------------------------------------
*From:* Joe Bohanon <jbohan...@gmail.com>
*To:* Don King <symmetryho...@yahoo.ca>
*Cc:* fo...@gap-system.org
*Sent:* Monday, February 2, 2009 11:28:39 PM
*Subject:* Re: [GAP Forum] File input
Sortex(<list>) will convert the list into the elements of S_n you want.
If you want to input a txt file, I would first open the file in a word
processor and turn it into a big list. For instance, add "list:=[" to
the beginning, do a find-and-replace finding ] and replacing with ],.
Then go to the end of the file, remove the extraneous comma and add "]:"
Then in GAP you do Read("file.txt"); (or put in the correct path if
necessary). Then List(list,Sortex) will give you what you want. If
you want a list without the commas, you can do, for instance:
list2:=List(list,Sortex);
for m in list2 do Print(m,"\n"); od;
Joe
On Mon, Feb 2, 2009 at 9:09 PM, Don King <symmetryho...@yahoo.ca
<mailto:symmetryho...@yahoo.ca>> wrote:
Hello,
I am wondering if a file input is supported to convert a list of
permutations into a list of cycles.
For instance,
I have an "a.txt" that includes
[1,3,2,4]
[2,4,1,3]
...........
The output I'd like to get is cycle formatted, such as
(2,3)
(1, 2, 4, 3)
....
If the file input is not supported, what commands can be used to
convert multiple permutations into cycles?
Thanks in advance.
Best regards,
Don
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