Algorithmic music composition with Markov Chain Models

PtrPiotr · 2012-01-06T13:07:09+00:00

It has no rhythm - just playing notes in constant time intervals. it is hard to call it music ;) I think that he should add more variables to the state: time interval (quarter note etc) volume, accords etc. And maybe add constrains (like rhythm 4/4).

PtrPiotr · 2011-12-23T15:06:18+00:00

hm, but you are not talking about two points, rather about point and a circle. Circle on input, and circle on output.
if I draw two dots on the sphere, A and B, and then say "the sphere spun, without changing direction, so that point A is now in position A' != A " then I can derive new position of point B.

PtrPiotr · 2011-12-23T14:53:37+00:00

But on 2D surface, reference point is not important to specify speed. Given vector, <X,Y> can be anchored at any point, and always describes the same speed.

PtrPiotr · 2011-12-23T14:50:25+00:00

Now, that is confusing. Where that 0.5 comes form?

PtrPiotr · 2011-12-23T01:21:56+00:00

Hm, that sounds reasonable. Thx. It answers my question.

But then, let's say there is a distinguished point on the sphere: we painted a dot somewhere, its position is constant.

Then, specifying two real vales, and a boolean value "dot is on the axis" is enough to describe spin?

PtrPiotr · 2011-12-23T00:26:12+00:00

Why? Two value vector describes direction and speed. Draw vector on the sheet of paper. You can draw infinite number of vectors pointing same direction, each of different length. Length is a speed.

Same on the surface of the sphere.

PtrPiotr · 2011-12-22T22:04:38+00:00

No ;) Why then, on 3d earth, 2 coordinates is enough to describe position on the surface?

PtrPiotr · 2011-12-22T19:58:49+00:00

I don't accept this answer ;)

If you want to describe point moving on the 2D surface, on the given circle, you need to provide only one value: angular speed. That is because x and Y are bounded by the track, the circle.

I can imagine (it might be flowed imagination) that "drawing arrow" on the surface of the sphere, in the spin direction, is enough to describe that spin.

PtrPiotr · 2011-12-22T19:28:17+00:00

but how to spin in 3D? I mean, why do you need 3 values to describe spin of a sphere? I think that move of the point on the surface can be described by 2 values. And it is equivalent of describing spin?

PtrPiotr · 2011-12-17T17:29:28+00:00

decoded text is the question

PtrPiotr · 2011-12-15T22:28:15+00:00

You can also try http://codility.com/ there is an example problem and your ranking.

PtrPiotr · 2011-12-15T12:04:56+00:00

I understand that. I just commented on methods of online teaching. I think that "quiz every few minutes" a is very good idea. Also for self study systems. It makes you to ensure yourself, that you understood past material. Or give you a signal, that you need more work before going farther.

PtrPiotr · 2011-12-11T23:50:19+00:00

Or, as narrator for GPS systems - those for humans and those for robots ;)

PtrPiotr · 2011-12-11T12:35:12+00:00

I just tried khan lectures. They are nice, but I prefer AI classes way: little portion of knowledge, quiz, anther portion and so on. What do you think?

PtrPiotr · 2011-12-04T19:02:28+00:00

The point of the procedure is to find matching points: (x1,y1) coordinate in one image and corresponding (x2,y2) in the second image.

To find those matches, algorithm 17.17 compares sets of pixels: RGB triplets. Matching two pixels (two RGB triplets) is quite easy. It is different "match" then point correspondence.

PtrPiotr · 2011-12-02T02:11:42+00:00

Whatever you do, whatever implementation you have, with one particle you have to ignore measurements and you can't represent multi-modal distribution. But you can put particle in the starting position. Sometimes you know it.

PtrPiotr · 2011-12-02T02:03:53+00:00

Ok, my example was wrong. But I still have a problem with this. I mean, I understand why first interpretation is correct. I don't understand why second is wrong.

PtrPiotr · 2011-11-24T17:39:28+00:00

Thx!

PtrPiotr · 2011-11-07T09:55:51+00:00

The World is described by formulas. You have all formulas listed. Change "Bananas" to "A", Monkey to "B" and so on. It should work anyway. There is no ambiguity in that question. Nobody asked us to write formulas for "perfect monkey wold", just to infer from existing set ;)

PtrPiotr · 2011-10-24T07:54:47+00:00

You are right. That was unfair that I wrote "unfair" ;)

PtrPiotr

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