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diff --git a/2025/talks/calc.md b/2025/talks/calc.md new file mode 100644 index 00000000..d7a6faee --- /dev/null +++ b/2025/talks/calc.md @@ -0,0 +1,60 @@ +[[!meta title="Basic Calc functionality for engineering or electronics"]] +[[!meta copyright="Copyright © 2025 Christopher Howard"]] +[[!inline pages="internal(2025/info/calc-nav)" raw="yes"]] + +<!-- Initially generated with emacsconf-publish-talk-page and then left alone for manual editing --> +<!-- You can manually edit this file to update the abstract, add links, etc. ---> + + +# Basic Calc functionality for engineering or electronics +Christopher Howard (he/him) - IRC: lispmacs or lispmacs[work], gemini capsule: gemini://gem.librehacker.com, <mailto:christopher@librehacker.com> + +[[!inline pages="internal(2025/info/calc-before)" raw="yes"]] + +An introduction to some of the basic Algebra and Calculus functionality in Calc, as might be useful in engineering or electronics. + +About the speaker: + +Christopher Howard is a simulator technician in Fairbanks, Alaska, and a GNU Emacs user for a little over a decade. My technical interests are focused on analog computing and modeling with differential equations. + +## Discussion / notes + +- Q: How sophisticated an ordinary differential equation solver would + be useful? There are some C libraries one ould try to build upon, + but there are many corner cases, stiff, non-stiff is one + categorization, but an explicit Runge Kutta would work for many + non-stiff equations + - A: I don't really have any opinions right now about the + approximation methods. For me, what I really want is one of + those old style languages where you basically just type in the + list of differential equations and don't have to do any other + computer programming, or know the details of another programming + language. I played around a bit with python-dda, though it has + some deficiencies. There are some graphical free software + programs where you do this sort of thing with blocks, but they + all depend on Java which is problematic in Guix. +- Q: Is there a way to see the input of a custom function? E.g. if you + forget the order of f and C in the example you showed + - A: Let's see... there is calc-user-define-edit. One calc also + view the file where the definitions are stored, though that is a + somewhat obscure format. +- Q: Have you tried interacting with calc via org-babel (first thing + that came to mind when you said that you'd like to annotate + values)? Any thoughts on that? How about rendering gnuplots on org + documents via calc? + - A: I played around with babel once like two years ago, trying to see if it would make more sense to use babel or one of those jupiter notepad things. But I guess I haven't really had any need to play around with either one since then. I don't really have any need to produce plots on org documents right now, but it is an interesting idea. +- Q: Who is in charge of calc development anyway? Is there an active maintainer? +- Nice talk. +- Thanks for the cool talk! I've been using Calc quite a lot recently for linear algebra work. I also use it quite often for unit conversion. There's a package called calc-currency which is very useful but unfortunately does not seem to be maintained anymore. +- I'm going to have to rewatch this talk. +- thanks for your talk! Calc strikes me as one of those really powerful things I should spend time learning a little more about one of these days =) +- calc is suprisingly good at datetime math. +- I mostly use it for that and unit conversion. I don't do any fancy calculus like lispmacs did in his talk. +- Funny, I'm studying computer engineering and just a few weeks ago I'd decided to properly learn how to use calc myself. +- Interesting descriptions of stargazing on Christopher Howard's gemlog + +[[!inline pages="internal(2025/info/calc-after)" raw="yes"]] + +[[!inline pages="internal(2025/info/calc-nav)" raw="yes"]] + + |