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12:02 AM
@R.M I should admit there was a long gap in between my use of version three and version six, so... :D
 
R.M
:)
 
Ok, it seems to take 25 seconds for 40 length words, but getting terribly slower every time
assuming the answer is correct, of counrse
 
@Rojo Did you try plotting the times it took to get a feel for the steepness of the increase?
 
On it
 
@R.M Wasn't suggesting you were - just wanted to let you know the back-story. He's a nice guy, so I hope he starts participating more actively.
 
12:09 AM
@J.M. there
O(n^n^n!!!!)
 
R.M
4 factorials? Or are you just excited? :)
 
@R.M 1 factorial and 1 factorial2, and 1 excitement sign
 
@Rojo In chat, you can just paste the URL of the image, if it isn't too big in dimensions... :)
 
@J.M. Thanks
 
@R.M Hella steep, that.
 
12:20 AM
Yeah
I'm sure I can improve it a lot by a factor, but, the steepness is too muuuuch
Not too different probably to the steepness of the number of solutions
 
R.M
@J.M. Heh, even for n=2, I'm sure that number is probably well beyond the number of atoms in the known universe
 
(Good news: there's an algorithm for it, after all! Bad news: it takes O(((n^n)!)!) effort... :D )
 
:D I wasn't so off then
Hehe
(I'm writing a Wiki article on it now)
Ok, when you can't beat the O, Compile everything. New approach
 
 
13 hours later…
1:25 PM
Anyone around with MATLAB running?
 
@J.M. sure
 
Could you try
w = [1 0 -1]/2;
M = magic(6);
filter2(w, M)
(I'm trying to compare Mathematica code I wrote with the original MATLAB, but I don't have access to a computer with MATLAB currently.)
 
Hmm. Matlab is being annoying. It refuses to save a new file.
 
R.M
   -0.5000   14.5000  -12.5000   -6.5000    1.0000    9.5000
  -16.0000   -2.0000    5.5000   -8.0000   -2.0000   11.5000
   -4.5000   14.5000   -6.5000  -12.5000    1.0000   13.5000
  -14.0000  -12.5000    5.5000   11.5000    1.0000    5.0000
   -2.5000   -2.0000   -3.5000   10.0000   -2.0000    7.0000
  -18.0000  -12.5000   11.5000    5.5000    1.0000    9.0000
 
Seconded. :P
 
1:41 PM
Ah, so the nearest to this is ListCorrelate[{{1, 0, -1}}/2, {{35, 1, 6, 26, 19, 24}, {3, 32, 7, 21, 23, 25}, {31, 9, 2, 22, 27, 20}, {8, 28, 33, 17, 10, 15}, {30, 5, 34, 12, 14, 16}, {4, 36, 29, 13, 18, 11}}, {{1, -2}, {1, -2}}, 0].
What if you use w = [-1;0;1]/2?
 
R.M
    1.5000   16.0000    3.5000   10.5000   11.5000   12.5000
   -2.0000    4.0000   -2.0000   -2.0000    4.0000   -2.0000
    2.5000   -2.0000   13.0000   -2.0000   -6.5000   -5.0000
   -0.5000   -2.0000   16.0000   -5.0000   -6.5000   -2.0000
   -2.0000    4.0000   -2.0000   -2.0000    4.0000   -2.0000
  -15.0000   -2.5000  -17.0000   -6.0000   -7.0000   -8.0000
 
0.5000 -14.5000 12.5000 6.5000 -1.0000 -9.5000
16.0000 2.0000 -5.5000 8.0000 2.0000 -11.5000
4.5000 -14.5000 6.5000 12.5000 -1.0000 -13.5000
14.0000 12.5000 -5.5000 -11.5000 -1.0000 -5.0000
2.5000 2.0000 3.5000 -10.0000 2.0000 -7.0000
18.0000 12.5000 -11.5000 -5.5000 -1.0000 -9.0000
 
R.M
@jVincent hmm... did I mess something up?
 
Nope, I did.
didn't see it changed to a column vector, I just inverted it.
 
Okay, I think my code checks out. Thanks, jVincent and R.M.!
 
2:08 PM
Where is it you find the formatting guide on the site?
nm, i found it.
@R.M Thx for the edit. I didn't know you could make keys, what's the syntax, I didn't see it in the helper?
 
@jVincent It's just the usual HTML, <kbd>.
No markdown equivalent for it, IIRC.
 
2:50 PM
Ahh, I misread the help section on this point. It starts out stating that not all html is supported, then shows an example with <kbd> unchanged, I figured the point was that it wasn't supported.
 
@jVincent A tad confusing, yes...
 
3:29 PM
posted on August 23, 2012 by Peter Aronsson

Since my childhood, I have always been impressed by big mechanical structures, especially things that are used for demolition of some kind, like demolition machines (cranes with big metallic balls thrown hard at concrete buildings) or machines for warfare. All kids are by nature intrigued by demolishing, and I guess that some of us never [...]

 
 
3 hours later…
6:41 PM
Bethany on August 23, 2012

We’re in New York, we’re in London, and as of August 5, we’re also in Denver! It’s true — Stack Exchange is growing up faster than we can keep up, but we’re excited to introduce our sales team at our brand-spankin’-new digs in Denver. (Seriously, it’s a pretty sweet office. Check out our before and after photos.)

 

Seth Mortenson, Sales

Hailing from Orange County (New York, not California), Seth enjoys the Colorado outdoors and spends his free time hiking, camping, snowboarding, and fishing. On the rare occasions when he’s not being active, you’ll likely find him catching the latest New York Giants game—which he says is the “greatest thing that’s happened since sliced bread.” …

 
7:07 PM
 

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