{%hackmd BJrTq20hE %} Context Given a system that contains $N$ unknown states, whose values at time $k$ are denoted as $$ \mathbf{x}_k \in \mathbb{R}^N $$ We want to know the values of $\mathbf{x}_k$, but we were unable to directly observe $\mathbf{x}_k$. What we have is a noisy observation $\mathbf{z}_k \in \mathbb{R}^N$ for any time $k$.

{%hackmd BJrTq20hE %} Overview Consider a system that consists of array of $n$ arbitrary sensors, the steering vector of the senor array represents the phase delays, with respect to a reference position, for an incoming plane wave at each sensor element. The phase delay for i-th senor is defined as $$ \exp( -j 2 \pi \frac{\tau_i}{T} ) $$

{%hackmd BJrTq20hE %} Read/Write CSV import pandas as pd a = pd.read_csv('input.csv') a.to_csv('output.csv', index=False) Merge DataFrames Merge by a common column "Merge" two data CSV files that

{%hackmd BJrTq20hE %} Terminologies Function v.s. Method: Function Method Independent of any object Associated to an object

{%hackmd BJrTq20hE %} Common diff options --numstat Shows number of added and deleted lines --name-only Show only names of changed files. --name-status Show only names and status of changed files. See the description of the --diff-filter option on what the status letters mean. --diff-filter=[(A|C|D|M|R|T|U|X|B)…[*]]

{%hackmd BJrTq20hE %} Terminology "buffer" vs. "window" vs. "tab" A buffer is the in-memory text of a file. A window is a viewport on a buffer. A tab page is a collection of windows.

{%hackmd BJrTq20hE %} 2013年的時候我曾花了不少時間想找一個好用的寫作平台。當時我給「一個好用的寫作平台」定出了下列要求： 要支援 Markdown 或 Textile 要能寫數學式 (比如說要支援 MathJax) 要能全站匯入(import)和匯出(export) 要支援中文的搜尋 要能方便秀程式碼 要有版本管理