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'[PIC]: faster square root'
2020\09\16@103448 by Christopher Head

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On Wed, 16 Sep 2020 12:58:52 +0100 (BST)
sergio <spam_OUTsmplxTakeThisOuTspamallotrope.net> wrote:

> This is "similar" to my method but uses the dreaded multiply

Why dread multiply? ATmega2560 has a hardware multiplier. Certainly
it’s helpful to have such algorithms around for
non-hardware-multiply-equipped processors, but in this particular
situation, the OP already chose a processor which has a multiplier, so
why not pick something simple and fast that uses it?
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Christopher Head

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2020\09\16@105336 by madscientistatlarge n/a

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I recommend the book "Numerical recipes in C"  I may try a couple of ways just to compare them and hopefully learn something.


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On Wednesday, September 16, 2020 8:34 AM, Christopher Head <.....cheadKILLspamspam@spam@chead.ca> wrote:

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2020\09\17@091908 by madscientistatlarge n/a

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I found the book at the library.  Great book.  Doesn't help with this, but lots of other methods for harder problems.  I do really appreciate all the discussion on this, and on the HAKKO soldering irons.  It'll be a lot easier to design for them now, rather than after I build a hopefully universal (or near to) soldering station.  I just need to provide for heater and TC sharing the same pins in some instances and have the software briefly cut out power so I can read the TC.  This is a great list, I've learned a lot, sometimes books don't have what you need, or it's hard to find.


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On Thursday, September 17, 2020 3:22 AM, sergio <.....smplxKILLspamspam.....allotrope.net> wrote:

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2020\09\17@135243 by David C Brown

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Another great book for bit  twidlers is* Hacker's Delight* by Henry S
Warren Jnr

I wrote a fast 16 bit divide by ten using his algorithm
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On Thu, 17 Sep 2020 at 14:22, madscientistatlarge <
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