Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: The Natural Philosopher 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 Lines: 63 Message-ID: References: <6BidndvG26Vec236nZ2dnZfqnPadnZ2d@giganews.com> <1834560e02e32793$90856$735129$802601b3@news.usenetexpress.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Tue, 08 Apr 2025 14:17:43 +0200 (CEST) Injection-Info: dont-email.me; posting-host="f34b094933bb9225046ebe3af6370ab7"; logging-data="2321201"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/d5dLXboGgCQYS3XcreMc49lqJbmPWzrI=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:tfVzDZ/X/Z9QCa5GbAp9T3Z8MJM= In-Reply-To: <1834560e02e32793$90856$735129$802601b3@news.usenetexpress.com> Content-Language: en-GB Bytes: 4284 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