Clojurians Log v2

@sogaiu Thanks. I'll poke the admin team and see who has the rights to restart it. #community-development is generally the best place to report community-related stuff like that.

Anyone happen to run Netgear Armor? I recently got a Netgeat mesh wifi system and I'm very happy with the speed, but they've also been pushing a subscription to Armor/Bitdefender pretty hard. I'm skeptical bc it seems pretty gimmicky, but also open to informed perspectives.

https://www.reddit.com/r/scala/comments/ipbprf/evolving_to_zio_or_cats_effects/

In python, the dataclasses module has a decorator you can use with the frozen=True argument to make immutable objects with a copy method a'la java or scala immutable objects

you can also use the pyrsistent library for persistent lists, maps, and sets

@idiomancy You want a function where f(x) = k(df/dx)

which e^kx fits

(d/dx) e^kx = ke^kx

but that will grow, not approach 0

(d/dx) e^-kx = -k(e^-kx)

For oscillations in springs particularly the math that describes that can either be given in terms of e^... or with sin and cos

ah thats interesting, so its common to use e^... to represent spring forces?

(source: have an undergrad in physics)

well, for the simple harmonic motion case, generally people use sin and cos

there is just a relation between the trig functions and e and people tend to express it in whatever form is more convenient

give me a moment to look up the expressions

https://wstein.org/edu/winter06/20b/notes/html/node30.html

oh hell yes!

thanks for the resource!

I don't think that will be all that much help in actually doing a simulation, but its a start

I also have a notebook from physics in high school that covers that stuff

what you want specifically sounds like spring motion w/ friction

http://hyperphysics.phy-astr.gsu.edu/hbase/oscda2.html

or "dampened oscillation"

The exact shape you are looking for sounds like underdamping

http://hyperphysics.phy-astr.gsu.edu/hbase/oscda.html#c3

which you more or less get by shoving

sin(wt)

where w is 2pi * the frequency you derive

and t is the time

with

e^-kt

which decays to 0 over time

and a some constants to make it balance out

so an offset in the sin part and a scale multiplication for the whole thing

I think you might be deriving percentage overshoot from control theory

but this is kinda the "result" of the math - depending on how you make your simulation this might just fall out of doing the forces at each timestep. But in simple cases you can hardcode the math and show it at different time steps

i remember seeing a few months ago someone's project on hacker news relating to saving all browsing history, and phone activity, etc, in a searchable format. Does this sound familiar to anyone? Ironically I believe I saved the link somehow, but can't find it via searching my github starts, or pocket, etc :man-facepalming:

welp, lemme tell ya, https://youtu.be/NmpZsud_ul4