1.5 KiB
1.5 KiB
English
Vocabulary
Item vocab idioms
Front
(it's) raining cats and dogs
Back
it's raining very hard
Computing
Item lisp emacs programming
Front
How to trap errors in elisp ?
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))))Mathematics
Item1
Text
The dot product of two vectors is {{c1::$|\alpha| \cdot |\beta| \cos{\varphi}$}}
Extra
Item2
Front
Given two vectors:
\begin{equation*} \alpha = \{a_1, a_2, a_3\}, \beta = \{b_1, b_2, b_3\} \end{equation*}What's the result of $\alpha \cdot \beta$ ?
Back
\[a_1b_1 + a_2b_2 + a_3b_3\]