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

Predict CPU Burst
Predict CPU Burst $$\tau_{n+1} = \alpha\cdot t_{n} + (1-\alpha) \tau_{n}$$ Usually $\alpha = 0.5$.
0001/01/01 · Notes
Pulse Sampling
Pulse Sampling See slides. Impulse Sampling is the ideal theoretical way of sampling a signal. However, in the real world our sample pulses have a duration, which leads to imperfect sampling. Duty Factor How much of the time within each sample the sample is held. $$d= \frac{\tau}{T}, \s 0 \leq d \leq 1$$ $d$: duty factor $\tau$: “width” of pulses $T$: Sample Interval - “distance” between samples Spectrum
0001/01/01 · Notes
Python Web Scraping
Python Web Scraping import requests from bs4 import BeautifulSoup url = "https://url.domain" response = requests.get(url) soup = BeautifulSoup(response.content, "html.parser") page_numbers_text = soup.find(class_ = "css-class").text
0001/01/01 · Notes
QQ-plot
QQ-plot QQ-plot er et plot der viser et datasæt, og hvor tæt de er på at være normalfordelt. QQ-plot-resudualer Residualer kan også være normalfordelte, hvilket er en god markør for regressionens tilnærmelse. Til dette laver man et QQ-plot over regressionens residualer.
0001/01/01 · Notes
Raketligningen
Raketligningen Gælder kun når vi ser bort fra ydre kræfter. $$\Delta v = u \cdot ln \left(\frac{m_1}{m_2} \right)$$ $u$: brændstoffets hastighed når det bliver skudt ud $m_1$: masse før $m_2$: masse efter $\Delta v$: ændring i rakettens hastighed I Jordens Tyngdefelt $$F_z=\frac{\Delta P_z}{\Delta t}$$ $$P_z = m \Delta v + \Delta m \cdot u$$ $$F_z=m \cdot \frac{\Delta v_z}{\Delta t} + \frac{\Delta m}{\Delta t} \cdot u$$
0001/01/01 · Notes
Rang af Matrix
Rang af Matrix Rangen a en matrix > $A$> er det (maksimale) antal uafhængige rækkevektorer i > $A$> . Eller Antal ikke-nul-rækker når > $A$> er på > row echelon form> . Full Rank All columns are completely independent; You cannot compute any given column, by multiplying any other column by a constant. Transponerede Matricer $$\rang(A^{T})= \rang(A)$$
0001/01/01 · Notes
Rationelle Funktioner
Rationelle Funktioner $$f(x) = \frac{P(x)}{Q(x)}$$ Ægte eller Uægte Polynomiumsbrøk Ordenen af $Q(x)$ er større en ordenen af $P(x)$ -> Ægte! Ellers er den Uægte. I en ægte brøk vil gå mod $0$ $$\lim_{x\to\infty}(f_{\text{ægte}}(x)) = 0$$
0001/01/01 · Notes
README
Notes for University Notes for my robotics degree at University of Southern Denmark. Installation The vault with settings can be installed using the install script. To download and run it use the command below. curl https://raw.githubusercontent.com/BalderHolst/uni-notes/main/install.sh | bash The install script can also be run after cloning the repo like this: git clone https://github.com/BalderHolst/uni-notes notes notes/install.sh This is a simple script that clones this repo and installs my settings from the settings repository.
0001/01/01 · Notes
References in C++
References in C++ An “alias” for a variable. The memory is still released when the original variable goes out of scope. If a reference references a variable that is out of scope, it becomes a “stale reference”. Like dangling pointers these “stale references” are usually unwanted. int i; int& r = i; r = 3; std::cout << i << std::endl; // output: 3 In Functions References are a way of making sure you do not copy the variables into a function (useful with large variables).
0001/01/01 · Notes
Registers
Registers A set of gated D-latches with the clock pins connected.
0001/01/01 · Notes