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Old 2021-05-14, 13:37   #58
EdH
 
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"Ed Hall"
Dec 2009
Adirondack Mtns

2·33·71 Posts
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Quote:
Originally Posted by garambois View Post
Edwin, this new regina file analysis tool is very powerful !
Thank you very much for all this work !

I still have some suggestions to improve it a bit, if in the next times you work on this program again :

1) In the advanced search, would it be possible to add a query "Range for number of iterations (min max) :" ?

2) Unless I'm mistaken, there are only two types of searches I can't do with this wonderful program (The equivalent of ##p, but for open end sequences and for sequences that end in cycles) :
I) Search for the number or list of sequences that merge with, for example, 276 or another open end sequence.
II) Search for the number or list of sequences that arrive on a perfect number, and on another cycle. This is much more difficult, even impossible, because to enter for example a cycle of length 4, there are 4 possible entry doors and there are many different cycles 4 !

Maybe I will find other things to add to the program when I start to analyze the data very seriously in a few months, when the regina file will have 20 M sequences or more !
But for the moment, this is all I see...

Congratulations, once again for the ease of use of this program and for the possibilities it offers !


Those that merge with other sequences are shown in the basic search, but I'm guessing you would like to also filter those (and the others) through the Advanced Function?:
Code:
Enter sequence (##/a/h/p/p##/q/u): 70508 
70508 is open ended. It merges with 276. 
Enter sequence (##/a/h/p/p##/q/u): 276 
276 is open ended. List any sequences that merge with 276? (y/n/c/f): y 
. . . 
77764     78718     79678     82604     82810     84094     85772     86158 
87566     88210     90010     90772     91684     92158     93798     93932 
94718     96098     96878     96912     97534     98008     99058      
167 sequences found. 
Enter sequence (##/a/h/p/p##/q/u): 3142 
3142 ends with the perfect number 496, 
Display all sequences that end with 496? (y/n/c/f): y 
496       608       650       652       790       1294      1574      1778 
2162      2582      3142      5158       
12 sequences found.
To perform cycle searches, you need to have wget and an Internet connection to reach factordb:
Code:
Enter sequence (##/a/h/p/p##/q/u): 83076 
83076 ends in a cycle. Display cycle? (starts at entry point) (y/n/f): y 
376736 
381028 
285778 
152990 
122410 
97946 
48976 
45946 
22976 
22744 
19916 
17716 
14316 
19116 
31704 
47616 
83328 
177792 
295488 
629072 
589786 
294896 
358336 
418904 
366556 
274924 
275444 
243760 
Display all sequences that end in this cycle? (y/n/c/f): y 
. . . 
66312     67078     67128     67894     69542     70846     71612     75536 
77506     77576     81898     82768     83076     83114     83328     84000 
85438     88692     91886     94214     97946      
85 sequences found.
But, again, this does not include the Advance filtering, "yet."

Last fiddled with by EdH on 2021-05-14 at 13:42 Reason: fixt spiiln errrer
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