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Diary, April 2013

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Sunday, April 14, 2013

Master of Go

I finished reading De meester van het go-spel (The master of go) by Yasunari Kawabata. A good discussion about this book, from a Go point of view, see Kawabata's Master of Go in the Sensei's Library. I found it quite an interesting book to read, but as a literary novel, I did not find it very good. I especially did not like the chaotic order in which the events are being told. At one point, I even thought that some pages were swapped due to the book being a misprint. This was in chapter 15 when the author is talking about moves 59 and 63, but one page later talks about stopping the game at move 43. The author reported about the game described in the book in 66 newspaper columns, and it almost seems as if he had accidently mixed up the order of these columns when working them into this novel. I also feel that the style of Kawabata is somewhere in the middle of a factual report and that of fictional novel. I guess that the book would have been beter, if he would have chosen one of those styles. I think I am also going to read "The Meijin's Retirement Game", which gives a more detailed description of the actual game.

Monday, March 15, 2013

3DF Samantha

Last Monday, I tested the 3DF Samantha by 3D Flow, a program that implements Structure from Motion. I tested the program on my own set of plant pictures and it did return some good results. The program can make use of Compute Unified Device Architecture (CUDA) to utilize the processing power of GPUs. On the PC I used for the test, CUDA is not working, so, I cannot make any statement with respect to the performance. 3DF Samantha is a command line utility and follows the normal steps of a Structure from Motion algorithm. The output looked kind of familiar, and at first I thought that it could be the case that the implementation is based on some of the other free implementations available that I have tested before. But I have been told that the code was written from scratch with the only exception of the bundle adjustment routines for which the SSBA library is used. The returned point cloud was not very dense (compared to other free applications and services), but I guess that it a good input for 3DF Stasia, the high fidelity Multiview stereo Technology by 3D Flow, which has not been released.

Wednesday, April 17, 2013

Diagonal mazes: exact results

I worked on a program to calculate the exact occurences of loops with certain lengths in diagonal mazes. This program tries all paths up to a specified length and counts how many of these end at the starting position. Paths that wander too far away, and never can reach the starting position, are avoided. The numbers found, match those found with the averages about the random generated mazes. The results are, with increasing area of the loop. The area is the half of the number of steps, because each step occupies half a unit square. The number of possible paths increase exponential with the length. Because of this, it is only possible to calculate the numbers for short loops. It is not clear whether it is possible to say something about the number of infinite paths.
 2 12.500000
 4  6.250000
 6  3.662109
 8  2.758789
10  2.106667
12  1.732349
14  1.441716
16  1.242055
18  1.083980
20  0.961059
22  0.861584
24  0.779843
26  0.711380
28  0.653467
30  0.603734

Thursday, April 18, 2013


Yesterday afternoon, the first flowers of our magnolia opened. This afternoon about one third of the buds had opened. This year flowering is quite late, because in March and the first week of April temperatures have been almost five degrees below average. The last weeks temperatures have been slightly above average, but they will get lower again the coming days, with the possibility of some freezing during the night. Today, there was quite a strong wind, and I was afraid that the flowers would have been blown away, but that did not happen.

Saturday, April 20, 2013

DVDs and books

This morning at 11:24, I bought six DVDs from bookshop De Slegte for €19,80 under the three for two rule. I bought: Hero, Final Fantasy: The Spirits Within, Final Fantasy VII: Advent Children, Lila dit ç, One Day, and La Fabrique des Sentiments. In the afternoon, I visited bookshop Kruimeltje and discovered that they were now selling books for one Euro each. When I went inside, I noticed that already many books were sold. I went to the second floor and looked if there are still some books by Mulisch available. In this bookshop there were often more books behind the first row on a shelve. When looking, around the shelves, my eye caught the name Anaïs Nin. I found a whole stack of her diaries translated to Dutch. I found a complete series ranging from 1931 to 1966. These are:

Sunday, April 21, 2013

Diagonal mazes: coloured by length

This weekend, I developed a script for MySample to colour diagonal mazes by length of the loops. Below a part of an image for a 1000 by 1000 simulation. The loops are coloured from red to green with increasing length. Loops that would be infinite if the the random generated simulation is used to tile in all directions are coloured blue. The image is rotated around 45 degrees to allow a compact representation.

I found this quite interesting. I am getting the impression that true infinite paths are very rare in a completely random pattern in all directions. This because the space that is available for loops above a certain length is becoming smaller, and thus resulting in a higher chance that they connect. I was also surprised how compact most loops are, or better said at how many places they touch themselves.

Tuesday, April 23, 2013

The Meijin's Retirement Game

This evening, I finished reading the book The Meijin's Retirement Game by John Fairbairn, which I started reading on the sixteenth, the day I received it in the mail after I ordered it from Go Show Keima. This book deals with the Go game Honinbo between Shusai and Kitani Minoru, which has been fictionalized in The Master of Go. I read the whole book, but I did not study all the diagrams in detail. I am afraid that most of the issues in the game are far above my level, but still I found it an interesting read. Although the book contains an appendix about The Master of Go, I somehow had hoped that it would be more integrated with this story. I think it would be interesting to have a novel from the viewpoint of the players, dealing about their thoughts and struggles. But who can creep into the minds of these Go masters?

Wednesday, April 24, 2013


This afternoon, almost all the flowers on our magnolia were wide open and a heavy scent was hanging around the plant.

Thursday, April 25, 2013

Henry Miller

This morning, I visited bookshop Kruimeltje in Enschede for the last time. At 11:24, I bought some books by Henry Miller for one Euro each.

This months interesting links

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