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Subject: Tired of trying to solve a Rubik's cube? rss

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João 'Finding a new way to make you WTF today' Marum
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Then get one of these!

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I can solve a RC faster then that contraption.
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Ken H.
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I can't solve it myself, but I am tired of people confusing my username with that toy.
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Alan Pengelly
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I wonder if it can make a cup of tea?
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Well that was onix-pected.
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Solving Rubik's cube in 6 steps:

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Paul DeStefano
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Actually, mathematically, a Rubicks cube can't be more than 17 steps from completion at any time.
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Ben Lott
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I thought this was a funny thing that the Mythbusters did. I'm not saying that the contraption in the original video isn't real. The sad thing is that I think it is real and some complete geek with nothing better to do with his time made that device to solve the cube.
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Mike K
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MWChapel wrote:
I can solve a RC faster then that contraption.


I suspect that a number of BGG inhabitants can. (I know I can.)

Now let's see that machine solve a 5x5x5.
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David Molnar
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Geosphere wrote:
Actually, mathematically, a Rubicks cube can't be more than 17 steps from completion at any time.


Well, 22, but, same thing.
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David Molnar
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MGBM wrote:
Then get one of these!


I thought you were going to say get one of these...

 
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Lukas Litzsinger
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Or just don't put the stickers on...


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Chris Crowder
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The contraption video is cool, but I am made a bit suspicious when the computer monitor doesn't update to show a completed cube. So what is it displaying if not the cube's current state?

I solved one manually for the first time ever last week (which is why I checked out this thread), but it took about three hours and a few false starts, even following the instructions posted here:
http://en.wikibooks.org/wiki/How_to_solve_the_Rubik%27s_Cube
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Peaceful Gamin'
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Geosphere wrote:
Actually, mathematically, a Rubicks cube can't be more than 17 steps from completion at any time.


Use a hammer and glue, and it's only 2 steps away.
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Blorb Plorbst
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Planar wrote:
I wonder if it can make a cup of tea?

Almost but not quite entirely unlike
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Jeffrey Sturgeon
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The contraption video is cool, but I am made a bit suspicious when the computer monitor doesn't update to show a completed cube. So what is it displaying if not the cube's current state?


The first thing it does is turn to each side.
Then it calculates the moves need to solve it ( you see brief pop-up while its "thinking"... ).
Then it makes the moves.

The monitor displays the initial state of each side of the cube.
There is no need to update the display with the state of each side.


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Dean
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I'm inclined to call foul for other reasons. While I have no grounds for doubting that the machine works as advertised, for the purposes of the video, I think it was staged. Seven moves is a suspiciously efficient solution for a general Rubiks cube solving algorithm. Either the machine knew exactly what it was getting, or it had already calalogued all 200 million permutations possible from seven moves, indexed by cubelet position.

Hmm, now I think of it, there's absolutely no reason why the machine can't scan this supposed catalogue for a quickie solution before embarking on an inefficient general solution. Nevermind. blush
 
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Dave Lartigue
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Blott wrote:
The sad thing is that I think it is real and some complete geek with nothing better to do with his time made that device to solve the cube.


Yeah, what kind of loser would ever try to figure out how to do something like this when instead he could be watching TV or pushing wooden cubes around a game board.
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Daniel Cedro Gomes
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I can solve the Rubik's cube ... but it take some time.
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Daniel Cedro Gomes
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ordago wrote:
Solving Rubik's cube in 6 steps:



LMFAO !!!!!
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Meh, I can solve a Rubik's Cube in a minute thirty to a minute forty-five seconds too. Only difference is mine is actually scrambled well before I solve it.
 
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Pieter
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GreenDude wrote:
I think it was staged.

Of course it was staged for the purpose of the video. If it would solve a random position, it would need a half-hour video. 2 minutes of it is interesting, more is not needed to show off the principles.

It is actually quite easy to do this

There are already programs that very quickly provide a solution for any configuration of the Cube. Such a program is running on the PC. The only two things you need now are: (1) A way to transfer the Cube's initial configuration to the program, and (2) a way to translate the solution to moves of the contraption.

(1) is done with the camera mounted above the contraption -- this is, in fact, the hardest to accomplish and it is not done by any Lego-stuff. Lego Mindstorms cannot process more than four separate input values, and thus cannot process camera images. This is all done on the PC.

(2) is the interesting Lego-bit, but it is fairly easy to accomplish. The solution for the Cube is a list of moves, which are translated to tipping of the Cube, rotating the base, and rotating the base while holding the top. It will probably take a few days to get it all working well, but nothing above and beyond amateur Mindstorms knowledge is needed.

Though I have to admit that I think that this is all extremely cool.
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I thought João was back, till I saw the date.
 
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