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Diary, January 2021

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Friday, January 1, 2021

Dolmen and burial mounds

Conny and I went walking in the forest near Mander where there used to be a dolmen and where there are several burial mounds. We also went searching for border poles and found the following: We again searched for pole 86-IV, but did not find it. We concluded that it must have been removed.

Saturday, January 2, 2021

Going home

Today, we went home from our stay in Manderveen. We decided to search for two border poles, but while drivingvthrough Germany, Conny thought that she saw some one. At first I dismissed it, thinking we were too far from the border, but than we saw another one. We went back to have a look at them. We visited the followein border poles:

Wednesday, January 6, 2021

Some wet snow

This afternoon, we had some wet snow. It is the first wet snow of this winter. Because temperatures are above zero Celsius, there is no chance the snow will stay on the ground.

Sunday, January 10, 2021

Cloud bow

This afternoon, Conny and I mada a walk through the country side. At one point, while walking with the sun on our backs, we noted some bright spots in the clouds. We noted some other bright spots in some other clouds, and realized that they were on a bow. When we walked further the bow became clearer. We also noticed some slight colouration: red on the outside and blue on the inside. We took several pictures. Above one that I stiched together (with Hugin) from two pictures. At home, I concluded that the phenomenon we saw was like a fog bow, or also called a white rainbow. Because it was not in the fog, but in a cloud, I would call it a cloud bow.

Tuesday, January 12, 2021

Palindrome date

Today is palindome date of the form (D)D-(M)M-YY and/or YY.(M)M.(D)D: 12-1-21 and/or 21.1.12. This year there are nine other palindrome date like this and six other special dates, one of which we already have had. All of these, including today, are:

Wednesday, January 13, 2021

Literate programming with Markdown

On March 20, I am going to give a (online) workshop on parsing. The workshop will start of with a overview of parsing and than explain the decision I took for implementing IParse. In the second part of the workshop, will consist of writing some simple grammar for IParse and test it on input. I am thinking about discussing RawParser, a reimplementation of IParse in 'raw' C, in the last part of the workshop. In the past months I have been working on RawParser and trying to add extensive documents to explain how it works, but I do not feel very happy about all the restrictions that C imposes on the order and level of detail you have to provide. A few days ago, I came across Build Your Own Text Editor and was rather charmed by it approach. It is generated from a collection of Markdown files and a steps.diff file with the help of a program called leg. This made me thinking about using Markdown as the primary source of the code and write a program to generate a C program from a collection of Markdown files. I think it is possible to make the program smart enough to reorder the Markdown code fragments and to allow a mechanism for extending the code without having to include many instructions where to include which piece of the code as in CWEB, a computer programming system created by Donald Knuth and Silvio Levy as a follow-up to Knuth's WEB literate programming system. I have started this approach on RawParser/doc/ file. As a positive side effect, working on this did result into some improvement of RawParse.c itself.

Saturday, January 16, 2021


Yesterday, on the news there was an issue about how today a snow front would go over the country from the west to the east. Yesterday morning, I already saw some small snow specks fall from the sky, some of which stayed on the roofs of the houses. In the evening, I made some curly kail hotchpotch (with no fried pork but with smoked sausage). Only in the evening, it started to snow and some of it on the roads. At least about 2.5cm of snow fell during the evening, based on my own measurement. The coming days the temperature is going to rise and the snow is expected to quickly melt away.

Saturday, January 17, 2021

Uncontrolled spread

The authorities reported that the spread of the VUI - 202012/01 COVID-19 variant in the Netherlands is no longer contained. They estimate that now about 10% of the COVID cases are the VUI - 202012/01 variant. I am not surprised about this. The authorities have over and over failed in this respect. They are expecting that by April it will be the dominant variant leading to next wave and advising the government to take new measures. The government is thinking about a curfew from 20:00 till 4:00. The experts of the RIVM should have realized that the new variants with higher infection rates were to arise and plan ahead to counter this. As far as I know, they did not do anything. They even did not enough screening of variants to detect the development of mutations. And once the new variant was discovered, they failed to scale up testing to contain this variant. It seems that they only thing they did was to estimate the spread of the new variant in order that they could adise the government with respect to measures to be taken. That can be seen as a clever strategy to avoid their primary responsibility to contain the spread of infectious diseases. Over and over again our government has failed to contain the spread of the virus by means of testing and contact research. It is only since a few months that people who do not have symptoms can be tested.

This months interesting links

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