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Nickname:?Jack Crenshaw???? Articles(34)???? Visits(81021)???? Comments(9)???? Votes(73)???? RSS
Jack Crenshaw's column features algorithms and plug-and-play routines, along with explanations of how they work.
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Posted: 02:13:31 PM, 21/05/2013
[Continued from Understanding the normal distribution (Part 4)] ? Working the statistics For my last trick, I'd like to show you how to use Equation 37 to compute statistical parameters like mean, variance, and standard deviation. For each of these parameters, we'll be evaluating in......

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Posted: 02:49:04 PM, 16/05/2013
[Continued from Understanding the normal distribution (Part 3)] ? What if I want areas? As we've discussed, the sum of the probabilities for all possible results must add up to unity. And indeed they do, in Figure 8. If, for a given "curve," you add up all the y-axis values at......

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Posted: 06:23:52 PM, 14/05/2013
[Continued from Understanding the normal distribution (Part 2)] ? Computing the odds It's time for a little math. Let N be the number of dice for a given experiment. The smallest value we can get from the throw comes when all the die are showing 1's, so the score must be N. Likewise......

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Posted: 06:24:46 PM, 10/05/2013
[Continued from Understanding the normal distribution (Part 1)] What are the odds? A good definition for the word "probability" is hard to find. The ones I've found use synonyms like likelihood or chance, so the definition is circular. Fortunately, most of us have an innate underst......

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Posted: 07:07:43 PM, 08/05/2013
Call it Hell, Call it Heaven, it's a probable twelve to seven that the guy's only doing it for some doll! Stubby Kaye and Johnny Silver, Guys and Dolls, 1955 This column delves on parameter estimation, a discipline is based on the fact that our knowledge of the state of any real-wo......

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Posted: 06:51:46 PM, 15/05/2012
[Continued from Getting embedded: a special connection (Part 2)] ? My next real-time job was among the most fun, mainly because I got to recommend all the parts of our development system and tools. It was for yet another satellite tracking antenna, only this one was in an airplane, and the......

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Posted: 03:40:15 PM, 11/05/2012
[Continued from Getting embedded: a special connection (Part 1)] Changes in the winds Fast forward to 1970. I was still programming an unseen mainframe in FORTRAN. That particular mainframe wasn't even in our building; it belonged to NASA. Our only contact with it was a courier, who made tw......

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Posted: 12:37:20 PM, 09/05/2012
At this moment, you have most likely heard that Embedded Systems Design magazine had its last print issue. That occasion is especially poignant for me, because so much!20+ years!of my career has been tangled up with the magazine in general, and the Programmer's Toolbox column in pa......

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Posted: 04:08:53 PM, 25/06/2011
[Continued from The evolving face of Mathcad (Part 1)] ? Generating print for textbooks is one thing. For a single scientist or small group, generating it for published papers was quite another. I well remember serious technical papers written on a typewriter, with all the math equations wr......

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Posted: 10:26:20 AM, 21/06/2011
There's some exciting news about a product I've lived with!and sometimes praised, sometimes cursed!for decades: Mathcad, PTC's leading math analysis tool. Regular readers know that most of my columns are math-oriented, as is most of my work. For that reason, I'm a hea......

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