Electronics Computer-Aided Design Re: Tri to Sine diode shaper

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Re: Tri to Sine diode shaper Joel Koltner 06-16-08
Posted by Martin Brown on June 16, 2008, 7:20 pm
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Joel Koltner wrote:
>> Yes, it's a pretty good book attached to some reasonably functional although
>> sometimes ugly code.
>
> I have a suspicion that all those high-powered math guys who initlally created
> the contents are often long gone and they're just hiring some generic
> programmers to port it from language to language, using some sort of
> regression testing to make sure nothing gets broken in the process.

They were physicists and engineers and the orignal was in Fortran.

You have to treat it with a little bit of caution. Some of the NA
algorithms contain typos in some of the languages and versions. And the
C/Pascal code shows its Fortran arrays with base index of 1 heritage in
places. Something which makes the bitreverse slightly opaque for instance.
>
> Not to mention they have some bizarre licensing scheme where just buying the
> book doesn't entitle you to use the printed code -- that's a separate
> purchase!
>
> I suppose it's still cheaper than Matlab with the appropriate toolboxes...

Although these days there are better free libraries available online
once you have a few keywords/references out of the book. The references
in the chapters are excellent. See sci.numerical-analysis for various
gripes about the known defects of the NA code. I think they go a bit
overboard on criticising it unfairly but you do need to treat the sample
code with a bit of caution. There are more robust solutions but most of
the time the NA code will work OK.

Reasonably functional sums it up pretty well.
Test carefully that it does what you want and you should be OK.

Regards,
Martin Brown
** Posted from http://www.teranews.com **

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