2.2 KiB
2.2 KiB
Deck in file
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Deck in entry
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Languages
Vocabulary
Raining vocab idioms english
Front
(it's) raining cats and dogs
Back
it's raining very hard
Grammar grammar english
名词从句
Front
名词从句有哪些形式？
Back
- That + 一个完整的句子, that无实际意义
- 由疑问句改装而成
Dialects
Cantonese
Front
食咗饭未吖？
Back
吃过饭了没？
Computing
Emacs Lisp lisp emacs programming
Front
How to trap errors in emacs lisp?
Back
(condition-case the-error
;; the protected form
(progn
(do-something-dangerous)
(do-something-more-dangerous))
;; handlers
(error-symbol1 (handler1 the-error))
((error-symbol2 error-symbol3 (handler the-error))))Math
Dot product
Front
How to calculate the dot product of two vectors:
\begin{equation*} \alpha = \{a_1, a_2, a_3\}, \beta = \{b_1, b_2, b_3\} \end{equation*}Back
\[\alpha \cdot \beta = a_1b_1 + a_2b_2 + a_3b_3\]