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Rules for making change

It happens a million times a day. Somebody pays cash for something and gets change. But there are rules, and Raymond's friend seems to like to break those rules . Luckily for Raymond's friend, one of the rules is the customer is always right ... or as Read More...
Posted Wednesday, November 25, 2009 10:40 AM by Maurits | 0 Comments
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How to turn on HDCP or SCMS in an audio playback app

There's an MSDN sample of how to turn on HDCP or SCMS in a playback app. The sample is loosely based on a test app I wrote, but there are still some rough edges. For example, the CMFAttributeImpl<T> template is not part of the SDK or the DDK. Also, Read More...
Posted Tuesday, November 10, 2009 11:07 AM by Maurits | 1 Comments
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Attachment(s): trustedaudiodrivers2.zip

Perl one-liner: approximate pi via Monte Carlo method

http://programmingpraxis.com/2009/10/09/calculating-pi/ > perl -e"print 4/(map{$n+=rand()**2+rand()**2<1}1..pop)*$n" 5000 3.1336 59 characters , plus arguments. Read More...
Posted Monday, October 12, 2009 7:32 AM by Maurits | 0 Comments
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Nitpicking László Polgár's Chess: ... #1071

I was reading László Polgár's excellent book Chess: 5334 Problems, Combinations, and Games and ran across #1071, White to move and mate in 2... Read More...
Posted Wednesday, September 02, 2009 5:55 AM by Maurits | 2 Comments
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Forcing Windows to install on a single partition

If you're installing Windows via a boot DVD, and you choose Custom, you have the option to rearrange partitions. I like use this to have each drive be one big partition. Windows 7 wants to set aside a 100 MB partition for something-or-other. I'm sure Read More...
Posted Friday, August 21, 2009 9:58 AM by Maurits | 1 Comments
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Tweaks I make every time I install Windows

As preparation for moving one of my machines from Vista to Windows 7, I'm compiling a list of all the little tweaks I like to make to machines that I use a lot: Boot from the Windows DVD. Delete all partitions; make each hard drive one big partition. Read More...
Posted Thursday, August 20, 2009 2:11 PM by Maurits | 7 Comments
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How to calculate a sine sweep - the right way

Last time I talked about how to calculate a sine sweep mathematically. There's a closed-form solution which is quite elegant but, alas, useless in a practical computer implementation due to the very bug numbers that are being fed to the sin(...) function. A computer implementation will care only about the discrete samples that need to be generated. The integral in the previous post turns out to be counterproductive - we're much more interested in the infinite sequence of φi, and more particularly in their residue mod 2π. Read More...
Posted Friday, August 07, 2009 3:12 PM by Maurits | 0 Comments
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Bad Perl: locker problem

Bad Perl solution to the " print the open lockers " problem: perl -e"print join', ',map{$_*$_}1..sqrt pop" 100 54 characters. I prefer this to the 53-character solution obtained by omitting the space after the first comma. EDIT: 49 characters: perl -e"print Read More...
Posted Wednesday, August 05, 2009 9:16 AM by Maurits | 0 Comments
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How to calculate a sine sweep - the wrong way

Suppose you want to generate a continuous sine-sweep from time tstart to time tend. You want the starting frequency to be ωstart, and the ending frequency to be ωend; you want the sweep to be logarithmic, so that octaves are swept out in equal times. Read More...
Posted Monday, August 03, 2009 2:07 PM by Maurits | 0 Comments
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Bad Perl: Josephus problem

Another programming contest asks to solve the Josephus problem . Bad Perl solution (83 characters... so close...) >perl -e" @_=(1..$ARGV[0]);++$c%$ARGV[1]?$i++:splice@_,$i%=@_,1while$#_;print@_ " 40 3 28 EDIT: got it down to 80. >perl -e" @_=(1..shift);++$c%$ARGV[0]?$i++:splice@_,$i%=@_,1while$#_;print@_ Read More...
Posted Wednesday, July 29, 2009 10:14 AM by Maurits | 1 Comments
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Bad Perl: Russian Peasant multiplication algorithm

I found this programming contest interesting: here's what I've got. perl -e " ($a,$b)=@ARGV;map{$c+=$_*$b}grep{$a&$_}map{1<<$_}(0..log($a)/log 2);print$c " 7 19 I'm calling this a one-liner because the part between the quotes is less than 80 Read More...
Posted Thursday, July 23, 2009 3:36 PM by Maurits | 0 Comments
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Bug - jack detection on Windows 7 hdaudio.sys mixed capture

I describe the Windows 7 hdaudio.sys mixed capture presence detection bug. Read More...
Posted Monday, June 22, 2009 2:47 PM by Maurits | 0 Comments
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Minimal unsatisfiable regular expression, XPath query

Regular expressions are a tool for matching generic text. XPath queries are a tool for matching chunks of XML. Both are search technologies. When using search technologies it is occasionally quite useful to have a query that will never match anything Read More...
Posted Monday, June 01, 2009 11:08 AM by Maurits | 0 Comments
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Why square waves have ears: Gibbs' phenomenon (Wilbraham's phenomenon)

In a recent post I sung the praises of square waves as a way to get a heckuva lot of power (3 dB more power than a sine wave) into a sample-range-limited signal. It's time to take them down a notch now. A problem with square waves is they're impossible Read More...
Posted Thursday, May 07, 2009 12:30 PM by Maurits | 0 Comments
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Daylight Saving Time and Benjamin Franklin

Daylight Saving Time is a thorn in my side. Politician: What time is it? Scientist: What time would you like it to be? It is my firm belief that Daylight Saving Time doesn't do any real good. Daylight Saving Time does real harm. Politicians love Daylight Read More...
Posted Wednesday, May 06, 2009 9:15 AM by Maurits | 1 Comments
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