Comments for Talk Nerdy To Me - Java, C#, .Net http://www.gavaghan.org/blog Mike Gavaghan blogs on Java, C#, .Net, and the software industry Sat, 26 Nov 2011 17:37:47 -0700 http://wordpress.org/?v=2.9.1 hourly 1 Comment on Intercepting Add and Remove of C# Event Delegates by Brij Sharma http://www.gavaghan.org/blog/2007/07/25/intercepting-add-and-remove-of-c-event-delegates/comment-page-1/#comment-878 Brij Sharma Sat, 26 Nov 2011 17:37:47 +0000 http://www.gavaghan.org/blog/2007/07/25/intercepting-add-and-remove-of-c-event-delegates/#comment-878 I always use += and -= to manage adding and removing event handlers. To explicitly do it in your code is something which I don't think is required but like in the topic above is good to show off. I always use += and -= to manage adding and removing event handlers.
To explicitly do it in your code is something which I don’t think is required but like in the topic above is good to show off.

]]> Comment on Java, GPS Receivers, and Geocaching: Vincenty’s Formula by Noel Grandin http://www.gavaghan.org/blog/2007/11/16/java-gps-receivers-and-geocaching-vincentys-formula/comment-page-1/#comment-868 Noel Grandin Tue, 25 Oct 2011 10:00:01 +0000 http://www.gavaghan.org/blog/2007/11/16/java-gps-receivers-and-geocaching-vincenty%e2%80%99s-formula/#comment-868 Wow, thanks. This is the only code I've found so far (and I've tried about 5 today) that matches up nicely with what Google Earth thinks is the bearing between 2 points. Saved me a ton of headache-inducing mathematics :-) Wow, thanks. This is the only code I’ve found so far (and I’ve tried about 5 today) that matches up nicely with what Google Earth thinks is the bearing between 2 points.
Saved me a ton of headache-inducing mathematics :-)

]]> Comment on C#, GPS Receivers, and Geocaching: Vincenty’s Formula by S Pola http://www.gavaghan.org/blog/2007/08/06/c-gps-receivers-and-geocaching-vincentys-formula/comment-page-1/#comment-847 S Pola Mon, 15 Aug 2011 07:56:46 +0000 http://www.gavaghan.org/blog/2007/08/06/c-gps-receivers-and-geocaching-vincentys-formula/#comment-847 Hi Mike, Your explanation and your C# library itself are brilliant. I've made use of your library in a small application I've built to make a grid of points. Your code and the example made my task much easier. Thanks very much. Cheers S Pola Hi Mike,

Your explanation and your C# library itself are brilliant. I’ve made use of your library in a small application I’ve built to make a grid of points. Your code and the example made my task much easier. Thanks very much.

Cheers
S Pola

]]> Comment on Liquid Cooling a PC: Gimmick or Necessity? by Air Cooled Air Conditioner http://www.gavaghan.org/blog/2009/10/06/liquid-cooling-a-pc-gimmick-or-necessity/comment-page-1/#comment-845 Air Cooled Air Conditioner Mon, 25 Jul 2011 12:21:28 +0000 http://www.gavaghan.org/blog/2009/10/06/liquid-cooling-a-pc-gimmick-or-necessity/#comment-845 Hi, One method that seems to be the next generation of system cooling is liquid cooling. Thanks, Daniel Hi,

One method that seems to be the next generation of system cooling is liquid cooling.

Thanks,
Daniel

]]> Comment on C#, GPS Receivers, and Geocaching: Vincenty’s Formula by Roman http://www.gavaghan.org/blog/2007/08/06/c-gps-receivers-and-geocaching-vincentys-formula/comment-page-1/#comment-843 Roman Wed, 01 Jun 2011 02:18:19 +0000 http://www.gavaghan.org/blog/2007/08/06/c-gps-receivers-and-geocaching-vincentys-formula/#comment-843 Hi Mike, Thank you for sharing this valuable information with others! Regards, Roman Hi Mike,

Thank you for sharing this valuable information with others!

Regards,

Roman

]]> Comment on C# Decimal and Java BigDecimal Solve Roundoff Problems by BlueRaja http://www.gavaghan.org/blog/2007/11/06/c-decimal-and-java-bigdecimal-solve-roundoff-problems/comment-page-1/#comment-841 BlueRaja Fri, 08 Apr 2011 13:46:15 +0000 http://www.gavaghan.org/blog/2007/11/06/c-decimal-and-java-bigdecimal-solve-roundoff-problems/#comment-841 Seems to me using base-15 would have made more sense: we could still represent decimal numbers exactly, but now divisors with factors of 3 could also be represented exactly, such as 1/3 or 5/6. Plus, every base-15 digit conveniently fits almost exactly into a single nybble (4-bits). Seems to me using base-15 would have made more sense: we could still represent decimal numbers exactly, but now divisors with factors of 3 could also be represented exactly, such as 1/3 or 5/6. Plus, every base-15 digit conveniently fits almost exactly into a single nybble (4-bits).

]]> Comment on Intercepting Add and Remove of C# Event Delegates by Hi Vis Jacket http://www.gavaghan.org/blog/2007/07/25/intercepting-add-and-remove-of-c-event-delegates/comment-page-1/#comment-840 Hi Vis Jacket Tue, 11 Jan 2011 14:05:50 +0000 http://www.gavaghan.org/blog/2007/07/25/intercepting-add-and-remove-of-c-event-delegates/#comment-840 A lot of good feedback on this article, thanks to everyone for sharing. Just like most things with Windows, there is more than 1 way to do things. More than 1 way to skin a cat, I suppose. ;D I don't have the need to dig further under the hood, so the += and -= operators work just fine for our every day applications, but it's nice to know we can expand on that if needed. A lot of good feedback on this article, thanks to everyone for sharing. Just like most things with Windows, there is more than 1 way to do things. More than 1 way to skin a cat, I suppose. ;D

I don’t have the need to dig further under the hood, so the += and -= operators work just fine for our every day applications, but it’s nice to know we can expand on that if needed.

]]> Comment on C#, GPS Receivers, and Geocaching: Vincenty’s Formula by Clemens http://www.gavaghan.org/blog/2007/08/06/c-gps-receivers-and-geocaching-vincentys-formula/comment-page-1/#comment-839 Clemens Wed, 10 Nov 2010 19:29:41 +0000 http://www.gavaghan.org/blog/2007/08/06/c-gps-receivers-and-geocaching-vincentys-formula/#comment-839 Hi Mike, I just came across your implementation of Vincenty's inverse formula. Two points are worth mentioning: 1. Marcelo is right in his comment from June 2008. Equations 3, 4 and 6 do not have to be calculated inside the loop. Neither Vincenty in his original paper does it, nor does the pseudo code in Wikipedia (http://en.wikipedia.org/wiki/Vincenty's_formulae) or the online calculator on Movable Type Scripts (http://www.movable-type.co.uk/scripts/latlong-vincenty.html). 2. In line 268 you should not use the relative change abs((lambda - lambda0) / lambda) as stop criterion, since lambda is a longitude difference, which may be zero. Calculating the distance between two point on the same meridian might well result in a division by zero. At least the algorithm iterates much to often. Simply use abs(lambda - lambda0) instead. Cheers Clemens Hi Mike,

I just came across your implementation of Vincenty’s inverse formula.
Two points are worth mentioning:

1. Marcelo is right in his comment from June 2008. Equations 3, 4 and 6 do not have to be calculated inside the loop.
Neither Vincenty in his original paper does it, nor does the pseudo code in Wikipedia (http://en.wikipedia.org/wiki/Vincenty’s_formulae) or the online calculator on Movable Type Scripts (http://www.movable-type.co.uk/scripts/latlong-vincenty.html).

2. In line 268 you should not use the relative change abs((lambda – lambda0) / lambda) as stop criterion, since lambda is a longitude difference, which may be zero.
Calculating the distance between two point on the same meridian might well result in a division by zero. At least the algorithm iterates much to often.
Simply use abs(lambda – lambda0) instead.

Cheers
Clemens

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