#17 reflect both axes


I'm requesting a new symmetry mode in the .table file format for simultaneous X and Y reflectivity, so that


can be written as


rather than this, using "reflect" symmetry


It might be called something in the lines of "reflectXY" or "reflect4".

And possibly another symmetry, "reflectY" for vertical reflectivity as "reflect" appears to reflect horizontally only (determined experimentally; there is no description in the help).


  • Andrew Trevorrow

    Probably better to discuss these ideas at the Rule Table Repository:


    Personally, I'm no longer all that interested in the .table format now
    that Tim Hutton has written make-ruletree.py (available in Golly 2.2
    or from the above repository as a featured download). This script
    makes it easy to create a new rule (as a .tree file) by writing a
    suitable transition function in Python. See the simple examples
    at the top of the script. Such functions are pretty easy to write --
    you don't have to know much Python -- and they are a lot easier
    to understand than the somewhat inscrutable .table format.

    You write the transition function in your favorite text editor, copy
    it to the clipboard, switch to Golly and run make-ruletree.py.
    The script grabs your code from the clipboard and uses it to
    create a .tree file, installs it in your rules folder and switches to
    the new rule. Very neat.

  • Nobody/Anonymous

    Thanks, After your suggestion I found a Java program included with Golly to make ruletrees. As I don't know much Python, but a lot of Java, I thought I'd give this a shot first. However, after starting out with my transition function, an automaton of 25 states and 8 directions, I noticed it would take 10 days on my computer to finish.

    I dug into the code and optimized it using the same basic techniques I always use and to my surprise it became 200 times faster! After some more fiddling around It became another 2 times faster, making it 400 times faster than the original!!

    Now it will only take 35 minutes to finish.

    The code is here:

  • Zom-B

    Zom-B - 2009-12-06

    (why wasn't I logged in?)

    I need to correct myself a bit. It felt like it was too good to be true. I accidentally entered 15 states instead of 25. With 25 states, it's still a 4.3 times faster than the original though.

  • Nobody/Anonymous

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