2020-12-28

notebook

random notes and unsorted content

links

youtube

how to disable ps4 dualshock controller sound on linux

when the controller is attached via cable, sound is routed to the controller headphone out by default. to change that, attach the controller, open pavucontrol, find the output for the controller and disable it. this setting should persist even if the controller is removed or the computer restarted.

how to open .txt files as csv with libreoffice

libreoffice --calc --infilter=csv myfile.txt

wakefulness inducing drugs: modafinil, tea and coffee

  • no drug can replace sleep
  • it is probably best to rarely or not at all use such drugs

    • to save money both from buying the products and potential energy costs, as well as time needed for preparation
  • tea and coffe do stain teeth, tea more so than coffee
  • modafinil

    • mainly it can be useful to try it a few times to learn about awakeness
    • can help when having a chaotic sleep rhythm and being tired after having slept too much
  • high quality grass fertilised sencha can give an effect similar to modafinil

motion planning demonstration

link

smooth video - upscale the framerate of any video to 60, 120, 144 frames per second

smoothvideo project

example on arch linux:

  • install mpv-git from archlinux because it includes vapoursynth
  • start the svp program, create a new custom profile and set the frame rate you want (x2, x2 1/2, custom, etc)
  • if it is active on every playback start it will show green text information in the left of the video, and show that it is active in the svp manager app
  • also check that it uses your custom profile
  • [https://www.svp-team.com/wiki/SVP:Linuxsvg](svp on linux manual)

might be necessary: ~/.config/mpv/mpv.config

[svp]
input-ipc-server=/tmp/mpvsocket
hwdec=auto-copy
hwdec-codecs=all
hr-seek-framedrop=no
resume-playback=no

from the svp mpv manual

high resolution videowalks in japan

2160p 60fps, no music or commentary

korean hangul learning resources 2018

prefix-notation

with prefix notation you do not say "1 plus 2 plus 3 plus 4 plus 5 plus 6 plus 7 plus 8", but "sum 1 2 3 4 5 6 7 8"

voting

it seems as if two-choice public votes/referendums/elections tend to lead to 50/50% results

fail terrorism ideology history

people fought and died for anarchism, fascism, communism, catholicism, islamism

idea statistic computer application

forever alone calculator: now you can confirm statistically that you will be forever alone. calculates from features like "smoker" "gender" "diet" "language" "distance" "age range". result in a percentage of current population matching

invention idea

  • vacuum light: have a strong light on the nozzle of a vacuum cleaner that shines parallel to the ground. the light will cast long shadows for dirt particles, making them visible clearly
  • a speedometer for bicycles that beeps when under a certain speed. benefits: increased excercise intensity by suggesting to increase effort. speed is often suprisingly difficult to guess. another benefit is that when slowing down to pass pedestrians, the beeping works as an automatic indicator/bell to warn other people
  • intrusion protection with irritant gas: on break-in, fill room with tear gas, requiring intruders to carry gas masks
  • spray soap

instant-messaging humor

when chatting with multiple people separately using instant messaging, you can copy text between conversation windows to let them unknowingly talk to each other

license difference programming

  • gpl: you care about your code being part of something free
  • other: you dont

tool marketing invention insight

tools can be harder to sell than the things one can do with them. especially if one wants to do something with them that noone so far wants to do, so that existing tools are already sufficient to most. trying to sell the tools means trying to sell them on what you can do with them, but noone will care since they dont want to do what they can do different, it is not significant, and for what the mass already wants to do, existing tools are more reliable

foreign quote science

  • knowledge -> wisdom -> insight

question progress civilisation

mathematicians in, say, the years 200-1000 already showed remarkable ingeniuity. smart enough that they should have been aware of a lot of things. if people where that smart, what prevented progress

school teaching learning

i want to learn what i want to learn when i want to learn it. contrary to school, where i am teached things i dont want to learn and things at times i dont want to learn them

silly internet fail

mastering herp derps. there are many types of herp derps. what are herp derps? a herp derp can be very powerful. it is often used in important tasks. more and more people are needing it every day, as the busy life of society continues. herp derp is so great, nobody can go without it. and it is so easy to understand, it is so simple, it will be trivial really. on this page, we will explain what it is. dont be afraid, it is not that hard to understand. take a deep breath and let's get our feet wet and dip our toes into the topic to deep dive on what this article is about. we will summarise all that it is, and give you the complete low-down on herp derp. so that at the end of this article, you will have mastered it. summary of the following contents: what is a herp derp, and what you can do with it. the name herp derp is constructed from the words "herp" and "derp". which means the words "herp" and "derp" are combined to describe one thing. the words are written with letters used in the english language. we are sure you will need herp derps frequently in your professional life, as it is that special. herp derp, as herp derps usually are, are very important. it is so strikingly useful, and so profound, that almost everybody should know what a herp derp is. even your grandma probably needs a herp derp at least once in her life. just like john derp herp, who in 1862 invented the first herp derp with his son, who had brown hair and was 152cm tall and made a joke in school that day and everyone laughed. on a breezy summer morning you could have seen the excitement in his eyes, as john discovered the immeasurable significance of herp derp. there are many different kinds of herp derps. it would be too much to explain everything in a single article. some are more useful, some less so, but all are at least somewhat similar. herp derp is simply a herp derp. we hope that you now know everything you need to know about herp derp to truly excel at applying herp derp in your future endeavours. share this article

fail mathematics

when trying to learn about mathematics and i understand nothing, all i am seeing is "simply", "easily", "just", "trivial", "straightforward", "remarkably easy", "very simple", "it is obvious", "clearly", "everybody knows", "simple equation" peppered through the documents. i would go as far as to allege that mathematicians even excel at explaining things from a disconnected perspective

idea programming syntax color

syntax highlighting:

  • use a different color for each function parameter
  • use a different color for bindings with the same prefix. for working with different modules

dangerous list

  • fine dust of grain and similar. surprisingly can catch fire explosively
  • wheels can come loose of vehicles with high weight and speed
  • tyres can explode
  • building demolitions can propel stones
  • standing in a flow of water can sweep the feet to the side and make one fall, hit the head, drown, sweep under, away
  • there are rivers that are narrow but deep, rifts filled with water, that have an extremely low survival rate in case someone falls in. ice rifts are almost certainly not survivable
  • low head dams

gun-control politics

two perspectives on gun control:

  • it is like a network of multiple streets branching off of each car, and not all can go every path. gun control blocks some dangerous paths
  • it is like wide empty highways every one can use, with signs on the sides that say "dont continue!", gold plated and payed for by the tax payers, which prevent noone from moving forward at full speed

bicycle transportation comparison pedestrian car

  • pedestrian: elementary school student. can not do anything, playball
  • bicycle: college student. more responsibility, still can not do much
  • car: boss. highest responsibility, steers, can do everything

path-dependence progress

  • switch now: hassle for a while. some benefits to the economy (buy new tools)
  • switch later: can become more and more difficult to switch after the old system manifests even deeper
  • switch never: never get the benefits

idea filesystem computer application

filesystem utilities: directory merge, splice, group into directory, move file upwards

family picture room idea

if having extra rooms: family picture room/museum. family members get a wall or a part of a wall and decorate it with lifes most dearest photos and other pictures

programming problem identifier modularisation

while an application grows and gets composed out of others, identifiers tend to have to be more specific. example: the link url, the content data link url, the project 1 content data link url, the site 1 project 1 content data link url

java forsite

what is javas double.min_value and double.max_normal in c?

  • from float.h: DBL_MIN and DBL_MAX.
  • not DBL_EPSILON

game server manager

  • gameservermanagers
  • install and management program for game servers on linux
  • 50+ games supported:
  • 7DaysToDie ARKSurvivalEvolved Arma3 Battlefield1942 BlackMesa BladeSymphony BrainBread2 CodenameCURE CounterStrike CounterStrikeConditionZero CounterStrikeGlobalOffensive CounterStrikeSource DayOfDefeat DayOfDefeatSource DayOfInfamy DeathmatchClassic DontStarveTogether DoubleActionBoogaloo EmpiresMod FistfulOfFrags GarrysMod GoldenEyeSource HalfLife2Deathmatch HalfLifeDeathmatch HalfLifeDeathmatchSource Hurtworld Insurgency JustCause2 KillingFloor Left4Dead Left4Dead2 Minecraft Mumble NS2Combat NaturalSelection2 NoMoreRoomInHell OpposingForce PiratesVikingandKnightsII ProjectZomboid Quake2 Quake3 QuakeLive QuakeWorld RedOrchestra Ricochet Rust SeriousSam3BFE Starbound SvenCoop TeamFortress2 TeamFortressClassic TeamSpeak3 Teeworlds Terraria UnrealTournament UnrealTournament2004 UnrealTournament3 UnrealTournament99 WolfensteinEnemyTerritory

digital music store

  • bandcamp.com
  • download of unrestricted files
  • lossless flac format as well as several other formats included in a buy
  • relatively low 10-15% fee for sellers
  • unlimited streaming for bought music
  • minimalistic and responsive interface
  • a wishlist and the option to follow artists and other users

international space station - how is living up there?

youtube video tours through the iss by different astronauts:

time formats

  • iso date: yyyy-mm-dd
  • iso time: hh:mm:ss
  • kiloseconds for daytime: ss.ss
  • week number 52-53

how to draw slopes with varying steepness

without specifying intermediate points in advance, with giving a value for rate to specify the steepness

(x, rate, previous_rate, previous_y, y_level)->
  x_rate = x * rate
  y_level =
    if previous_rate is rate
      y_level
    else
      x - x_rate + previous_y - (x - (x_rate - rate * (x - 1)))
  y = y_level + x_rate
  [y, y_level]

not obvious in this procedure, that can possibly be simplified, is how values have to be adjusted to keep the starting points of new steeper or shallower segments attached to the end of previous ones. one can imagine lines of f(x) = rate * x with different rate. the lines cross only at zero and it looks a bit like a fan. with this function, one can get only points on separate slopes, with straight changes when starting to draw parts of different ones. it is possible to translate the starting point of any possible slope by addition or subtraction to make it cross at exactly the point where rate changed and start drawing a segment from there. in the above function, x and rate are the main parameters and the values used for correction are related to the center y = x slope and the end point of the previous segment.

but, this creates an ever growing number and there is potential for increasing numerical error with floating point numbers, either because the value becomes large and less exact or the input of previous_y and y_level accumulates errors through addition.

a probably better alternative would be a function that takes width and height instead of rate, to be able to calculate an endpoint, and then use an interpolation function to get points between the start and end points. if width or height changes, the target point would just move