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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.os.linux.advocacy,comp.os.linux.misc
Subject: Re: Rewriting SSA. Is This A Chance For GNU/Linux?
Date: Tue, 8 Apr 2025 13:17:42 +0100
Organization: A little, after lunch
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On 08/04/2025 12:59, Farley Flud wrote:
> On Mon, 07 Apr 2025 17:59:45 -0400, c186282 wrote:
> 
>>
>>     Indeed ! However ... probably COULD be done, it's
>>     a bunch of shifting values - input to some accts,
>>     calx ops, shift to other accts ....... lots and
>>     lots of rheostats ........
>>
> 
> How is conditional branching (e.g. an if-then-else statement)
> to be implemented with analog circuits?  It cannot be
> done.
> 
You can do better than boolen logic
You can use an adder and a comparator.
If the sum of all the inputs is greater than X then Y, Else not Y#
You can use Y to switch another set of analogue circuits off or on.

Or even use the sum of all the inputs to modify the gain of an amplifier.

If you have a digital problem use a digital computer if not then think again


> Analog computers are good for modelling systems that are
> described by differential equations.  Adders, differentiators,
> and integrators can all be easily implemented with electronic
> circuits.  But beyond differential equation sytems analog
> computers are useless.
> 
Exactly

> The Norden bomb site of WWII wan an electro-mechanical
> computer.  It's job was to calculate the trajectory of
> a bomb released by an aircraft and the trajectory is described
> by a differential equation.
> 
And it was the biggest heap of shit ever missold to the USAAF

> One of my professors told a story about a common "analog"
> practice among engineers of the past.  To calculate an integral,
> which can be described as the area under a curve, they would plot
> the curve on well made paper and then cut out (with scissors)
> the plotted area and weigh it (on a lab balance).  The ratio
> of the cut-out area with a unit area of paper would be the
> value of the integral.  (Multi-dimensional integrals would
> require carving blocks of balsa wood or a similar material.)
> 
> Of course it worked but today integration is easy to perform
> to unlimited accuracy using digital means.
> 
Not unlimited either in precision or in compute time


>   

-- 
For in reason, all government without the consent of the governed is the 
very definition of slavery.

Jonathan Swift