Archive for the ‘Technomancy’ Category

Exporting “Safe Senders” from Windows Live Mail

March 20th, 2012 No comments

This note relates to Windows Live Mail version 2009 (Build 14.0.8117.0416) running in Windows XP.

I found it impossible to export or copy ‘n’ paste the Safe Senders the addresses from Tools->Safety Options in my Windows Live Mail. I wanted to do this to import the list to the server-based Junk Mail filter provided by my email host.

A bit of digging about in the registry exposed the location of the Safe Senders list as

[HKEY_CURRENT_USER\Software\Microsoft\Windows Live Mail\PerPassportSettings\0\Junk Mail\Safe Senders List]

Unfortunately each address is saved in a separate registry subkey, so a bit of text manipulation is required after exporting the above Registry key to a .REG file. I used Edit-Plus to sort the file, strip out the non-pertinent stuff and perform a find-and-replace on the lines containing the email addresses, which are of the format


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Here is a knockout formula

October 11th, 2011 No comments

a = 2 (n – R)

I always like a good real-world application of mathematics, in this case algebra.

FA Cup draw

Photo by Matlock

The question

If you’re organising a knockout tournament for something and the number of players or teams is not a neat power of two, how many players have to be drawn in round 1, so that round 2 is a neat power of two? I figured this out by solving this pair of equations:

a + b = n
0.5a + b = R

where a is the number of players to be drawn in round 1, b is the remainder of players to be drawn in round 2, n is the total no. of players and R is the largest power of two less than or equal to n.

Solving the equations

0.5a + (n-a) = R
a + 2n - 2a = 2R
2n - a = 2R
a = 2n - 2R
a = 2(n - R)

An example

91 players enter our tournament, how many must be drawn in round 1?
n = 91, R = 64
a = 2 x (91 - 64)
a = 54
So we draw 54 players in round 1, which produces 27 winners to meet the remaining 37 players in round 2.

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Top 100 twitter clients

September 11th, 2011 1 comment

I have repeated the sampling of Twitter’s “sprinkler hose” that I carried out in April 2010. The data suggests that less than 10% of Twitter users are using to interact with Twitter. The sample is based on 116,293 tweets captured between 4pm and 5pm BST on 11 Sep 2011. Read more…

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Top twenty Twitter clients

April 14th, 2010 No comments

Following my experiment with sampling the public Twitter timeline this morning, I ran another sample, this time for much longer and at a time of day, when many American users would be active to get a slightly more accurate breakdown of the top twenty Twitter clients. Read more…

Sampling twitter: the full client breakdown

April 14th, 2010 Comments off

This is an appendix to my post on Sampling Twitter to determine client breakdown. Below is the full breakdown of the client source of tweets sampled on 14 April 2010 for around 15 minutes from 12.30pm UK time. Total tweets sampled: 21912. Read more…

Sampling Twitter to determine client breakdown

April 14th, 2010 No comments

sampling the public timelineThe arrival of promoted tweets on Twitter got me thinking about how people post their tweets, as the initial dipping of the Twitter toe into monetization will only impact users of

So, how many people actually use the website to post their tweets? What are the most popular clients? Read more…

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