Daniel Krizian danielkrizian

useful spacemacs commands

SPC q q quit
C-g abort action
SPC w / split window vertically
SPC w - split window horizontally
SPC w c delete current window
SPC f f find a file
SPC f s save a file (:w also works)
SPC p h find a file in current project
SPC b d kill current buffer

mystery behind `./[matrix; ;+;1] @ i1,i2,i3`

key concepts involved (layered in that order):

matrix is two dimensional list
indexing at depth: .[;] - see more https://code.kx.com/q4m3/6_Functions/#682-verb-dot
dot apply : .[;;;] - e.g. https://code.kx.com/q4m3/6_Functions/#687-general-apply-for-dyadic-functions
projection : f[x;y;z] is same as f[x;;z] y
iteration : over (/) - e.g. https://code.kx.com/q/ref/adverbs/#over

indexing matrix at depth; as opposed to @ - indexing at first level:

ORG Cheatsheet

http://spacemacs.org/layers/+emacs/org/README.html https://org-babel.readthedocs.io/en/latest/ https://gist.github.com/drj42/1755992 https://github.com/kshenoy/dotfiles/blob/master/emacs.org

Breakpoints

key	description
`b funName`
`d 1`	deletes breakpoint
`disable 1` `enable 1`	disable/enable breakpoint
`d.`	deletes all breakpoints
----------------------	-------------------------
`r` `run`	start program (with args)

special parameters

$ last argument passed to the previous shell command https://stackoverflow.com/questions/547719/is-there-a-way-to-make-mv-create-the-directory-to-be-moved-to-if-it-doesnt-exis
$! pid of the most recently executed background pipeline

files

tar

tar -xvf archive.tar.xz
tar -zxvf archive.tar.gz

copy

Definitions

buffer vs window vs frame
modeline
echo area
minibuffer
font locking correct term for syntax highlighting. made up of faces of properties (color, font, text size …) that pretty-print the text
point another word for caret or cursor: visual marker where characters typed will appear
mark
region contiguous block of text bounded by point and mark. in other editors called “selection” or “highlight”
current buffer buffer that has the point

matrix multiplication

https://youtu.be/XkY2DOUCWMU?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab q stores matrices in column-major order - it means that first element of each list is first column, second element is second column etc

special case: float vector is Nx1 or 1xN (if enlisted) matrix

q)enlist[1 2 3f] $ 1 2 3f                            / rows times columns
,14f
q)(1 3f;-2 0f)$-1 2f                                 / 5 2; (x-axis coords;y-axis coords); has columns 1 -2 and 3 0
q)(1 1f;0 1f)$(0 -1f;1 0f)                           / (1 -1f;1 0f);

hourly runs

https://linuxhint.com/cron_systemd_timer/

cat /home/dk/.config/systemd/user/gdrive.org.service
[Unit]
Description=Upload org files to my google drive
# after networking is up on the server
After=network.target

	# (base) dk@ ~ /proj/qlib/qcon$ conda build .

	No numpy version specified in conda_build_config.yaml. Falling back to default numpy value of 1.11
	WARNING:conda_build.metadata:No numpy version specified in conda_build_config.yaml. Falling back to default numpy value of 1.11
	Adding in variants from internal_defaults
	INFO:conda_build.variants:Adding in variants from internal_defaults
	Attempting to finalize metadata for qcon
	INFO:conda_build.metadata:Attempting to finalize metadata for qcon
	BUILD START: ['qcon-2020.02.05-0.tar.bz2']
	Cloning into '/home/dk/conda/conda-bld/qcon_1606553400852/work'...