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Sunniest spring
The past three months, where the most sunniest on record. On average over the
whole country we had 790 hours of sunshine while on average there are 517
hours. The previous record from 2011 was 743 hours. It was also very dry. We
only had (on average over the whole country) 77mm where 172mm is normal.
The weather station at Twenthe Airport measured 752.2 hours of sunshine and
95.5mm of rainfall.
Book
At 17:17, I bought the following books from charity
shop Het Goed:
- De Eersten van Rissan written by Wim Gijsen in Dutch and published
by Meulenhoff in 1984,
ISBN:9029011432, for € 1.65.
- Bovengronds: 15 jaar kunstbezit bij Gasunie edited by Chris de Boer
and Jan Hekman, written in Dutch, and published by N.V. Nederlandse Gasunie
in November 1997,
ISBN:9789071728150, for € 1.45.
- One hundred thirty seven thousand and sixty-one edited by Dorrie
Tattersall and Petra van der Jeught, written in English and published by
Jan van Eyck Academie in 2009,
ISBN:9789072076885, for € 3.00.
Red rainbow
When at 21:56 I left home the sky was red due to the sunset. It was also
raining a little and I saw a faint single but complete rainbow. I also noticed
that it was quite red. Just before ten, I took a picture, which is show here,
after I increased the saturation a little to increase the visibility of the
the rainbow.
Suguru puzzles
I wrote a program to map Suguru/Tectonic puzzles
on an Exact Cover. The exact cover solver
should be able to read the input of a number of columns separated with commas,
where the numbers may be in any order. The program reads the input from the
standard input. An example of the input format is:
*-*-*-*-*-*
| |4 |4 |
*-* * * * *
| | 1| 2|
* *-* * *-*
| | | | |
*-*-*-*-*-*
Father day present
Annabel gave me a pyramid maze, which she has
made from wood with a laser cutter and for which I wrote
the program. Below a
photograph of the maze.
Planning AKI Mupi route
I wanted to find a route to visit all the Mupi's of AKI Finals Mupi
route. I spend some hours drawing connection routes (with Google Earth) between the mupi locations and noting down the distances.
(The results in KML file or
Google Maps.) I made a drawing of this:
Finding a shortest route is the Traveling Salesman Problem as a graph. I searched for a solver. I came across TSLIB95. I installed TSPLIB 95, but when I enter the import tsplib95 in
Python 2.7.17, I get a SyntaxError on line 5 of bisep.py. The pages
do not mention which version of Python should be used. I downloaded
tsp_brute from Brute Force Solution of Traveling Salesman Problem and got it compiling
with g++ with some modifications. Next I wrote a
program to generate the matrix from the graph. The tsp_brute took
a long time crunching and I killed it after some time without it producing a
solution or showing any sign of process. I tried to find some route myself,
and found a route of length 26.181 meter. Next, I wrote added an algoritm that
incrementally removes the longest connection lest any node get less than two
connection. From the resulting list of fragments, some cicular, some with
branches, I constructed another route with a length of 25.641 meter.
AKI Mupi route
Today, I biked the route
(in Google Maps) I found yesterday, although I followed the route by
heart (except for some small change), I missed one of the Mupi's along the
route. It was the Mupi with a reproduction of the works by
Julia Hofman. I left at 9:29 and returned at 12:03.
Below the list of Mupi's I encountered with a short description of the work as
I precieved it.
This months interesting links
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Monday, June 15, 2020