Balder W. Holst

Hello there!

My name is Balder and this is my personal website. Here i write down what i learn to maybe help others some day. For now i will just act like people are reading my articles, and make them for fun.

This website has three main sections:

I write these articles for fun, and even though i try to make sure that they are correct, i am not a perfect human and there are sure to be mistakes. Below is a list of most recent articles in all categories.

Recent Posts

Connect to Wifi in Linux with nmcli
Connect to Wifi in Linux with nmcli nmcli is a command line tool for interacting with NetworkManager which handles wifi. It is useful as it is installed in many distros by default, and therefore provides a standardized way of connecting to wifi and managing connections. Connect to Wifi nmcli d wifi list --rescan yes note: d is short for device and --rescan yes makes sure that nmcli scans for wifis before listing them.
2023/02/18 · How-toes
About
About Me I am a danish university student studying Robotics at the University of Southern Denmark. Software, robotics, electronics are all incredibly interesting to me, and i therefore spend a lot of time working on small projects here and there. The ones that amount to anything can be found on this website. Links GitHub LinkedIn This Website This is a static website built with hugo. I use my custom forked version of the monochrome theme by Kaiiiz.
2023/02/17 ·
The Idea
Sqlite Integrated - The Idea I have this past month been developing my first python package! Its called sqlite-integrated in the pypi. Its purpose is to simplify editing sqlite3 databases. Originally is was my intention to represent a database entry simply as a python dictionary. Like this: entry = {"id": 3, "Name": "Tom", "Age": 23} This is nice because it makes it possible to use familiar python dictionary syntax to change the entry.
2022/09/06 · Projects / Sqlite Integrated
Abstract Classes in C++
Abstract Classes in C++ A base class which cannot be instantiated by itself. This is accomplished by declarations without definitions in the abstract class. An abstract class has at least one purely virtual method. Purpose: Force all classes that inherits from the abstract class to implement its methods. Used for defining interfaces.
0001/01/01 · Notes
AC
AC Alternating Currentl Phasor Representation Sinusformet signal Harmoniske svingninger
0001/01/01 · Notes
Acceleration af partikler
Acceleration af partikler $$\Delta E_{kin}=q \cdot U_{acc}$$ $\Delta E_{kin}$: Ændringen i kinetisk energi, når partiklen accelereres gennem *hele* spændingsfeltet. $q$: partiklens ladning $U_{acc}$: Accelerationsspændingen
0001/01/01 · Notes
ADC
ADC Analog to Digital converter Resolution ($n$): meaning $2^n$ steps from $0$ V to $V_{ref}$. This also determines the size of the digital output. Conversion time: How long it takes to convert. Use differential inputs to be less sensitive to noise.
0001/01/01 · Notes
ALU
ALU See slides: Lesson 3.pdf>page=21 A logic circuit where a signal selects the operation the component does to its two inputs. The inputs are usually more that one bit each.
0001/01/01 · Notes
Amdahl's Law
Amdahl’s Law How much multi-threadding can speed up the execution of a program. $$\text{speedup} \leq \frac{1}{S + \frac{1-S}{N}}$$ $S$: The percentage of the program that can be executed on multiple cores. $N$: Number of cores.
0001/01/01 · Notes
Andengradspolynomier
Andengradspolynomier Forskrift $$f(x) = ax^2 + bx + c$$ $a$ = hældnings factor (bestemmer også retning af grafen, $a \neq 0$) $b$ = hældningen i $x = 0$ $c$ = skæringspunkt med $y$-aksen Grafen som et andengradspolynomie beskriver kaldes en parabel Toppunktet Punktet hvor hældingen er 0 Formel $$\left( \frac{-b}{2a}, \frac{-d}{4a} \right)$$ Bevis Dette er funktionen for et andengradspolynomium $$f(x) = ax^2+bx+c$$ Vi differentierer $$f'(x)=2ax+b$$ Vi ved at hældningen skal være $0$ i toppunktet, derfor sætter vi $f'(x)$ til $0$ $$0 = 2ax+b$$ Isolerer $x$ $$x=\frac{-b}{2a}$$ Dette er altså toppunktets $x$-koordinat.
0001/01/01 · Notes