Friday, October 19, 2018

Arch: System freezes when coping large files from usb

Add the following two lines to /etc/sysctl.d/99-sysctl.conf (create if not exists)
vm.dirty_background_ratio=1 vm.dirty_ratio=2
vm.vfs_cache_pressure = 50

To apply use sudo sysctl -p /etc/sysctl.d/99-sysctl.conf or restart.

Tuesday, October 02, 2018

Arch: Python 3.6 rpc/rpc.h missing

The solution was to manually specify where `rpc/rpc.h` was for configuration: CPPFLAGS="-I/usr/include/tirpc" ./configure --prefix=/opt/python362 --enable-shared -I/usr/include/tirpc

Monday, September 24, 2018

youtube-dl: download mp3 and skip on failure

youtube-dl --extract-audio --audio-format mp3 -i PLAYLIST_URL_OR_VIDEO_LINK

Monday, September 17, 2018

MATLAB: vision.ShapeInserter crashes in Arch Linux

Seems its same problem as here: https://au.mathworks.com/matlabcentral/answers/364727-why-does-matlab-crash-on-linux-fedora-26-with-a-segmentation-violation-r2017b-or-later#answer_289066

Solution was to remove libfreetype files from /opt/MATLAB/R2016a/bin/glnxa64

sudo mv libfreetype* exclude/

Sunday, September 16, 2018

Arch xfonts 75 and 100

sudo pacman -S xorg-fonts-75dpi xorg-fonts-100dpi

Thursday, August 30, 2018

rsync: make a backup

Example:
rsync -avh -R --info=progress2 --delete /home/source/folder /run/media/backup/folder

Wednesday, August 29, 2018

rsync: copy files over ssh with non-default port

rsync -azvh -e 'ssh -p 22222' ./source_folder user@destination_ip:/destination/folder/name

Thursday, August 23, 2018

Setting default terminal in Nemo

gsettings set org.cinnamon.desktop.default-applications.terminal exec terminal

Thursday, July 12, 2018

ffmpeg: Extract audio to mp3 from multiple mp4 video files

for i in *.mp4; do ffmpeg -i "$i" -q:a 0 -map a "$(basename "$i" .mp4)".mp3 ; done

Sunday, July 08, 2018

Linux: Download audo only from twitch (including live stream)

Show available video formats:
youtube-dl --list-formats twitch_url_to_video
Download only audio:
youtube-dl -f audio_only twitch_url_to_video

Wednesday, July 04, 2018

Thursday, June 07, 2018

Cmake: compile using clang instead of gcc

export CC=/usr/bin/clang
export CXX=/usr/bin/clang++
cmake ..

Thursday, May 31, 2018

ssh config

Example
# contents of $HOME/.ssh/config
Host dev
HostName dev.example.com
Port 22000
User fooey

From: https://nerderati.com/2011/03/17/simplify-your-life-with-an-ssh-config-file/

Monday, May 28, 2018

i3: add rofi key $mod+d

Edit .config/i3/config:
bindsym $mod+d exec "rofi -combi-modi window,drun -show combi"

Tuesday, May 15, 2018

Sunday, May 13, 2018

Arch: List of recently installed and upgraded packages

cat /var/log/pacman.log | grep -i upgraded cat /var/log/pacman.log | grep -i installed

Monday, April 30, 2018

Tilix: Arch config settings file location

The config parameters are stored in dconf. Install `dconf-editor` from aur to edit them
yaourt -S dconf-editor
In the dconf-editor search for "Tilix" to find its settings, or go to /com/gexperts/Tilix

Sunday, April 29, 2018

Start MATLAB in Linux termianal

alias mat="/opt/MATLAB/R2016a/bin/matlab -softwareopengl -nodesktop -nosplash"

Sunday, February 18, 2018

Lowess smooth in logistic regression using R based on Applied Logistic Regression, 3th ed, HOSMER

To to determine linearity in the logit for a continuous variable, one can use lowess smoothed scatterplot as described in Applied Logistic Regression, 3rd Edition, in chapter 4.2.1 Methods to Examine the Scale of a Continuous Covariate in the Logit.

In the book this is illustrated using Scale_Example data from the book and STATA. I dont have stata, but this can be replicated with a good agreement in R.

For this, I will use logitloess function described here.



The data sets used in the book can be obtained here: http://wiley.mpstechnologies.com/wiley/BOBContent/searchLPBobContent.do # read in Scale_Example.txt that contains data for the example
mydata = read.table("~/Applied_Logistic_Regression_by_Hosmer_Lemeshow_3th_ed_2013/Scale Example/Scale_Example.txt")

# seperate data into x and y
y=mydata[,1]
x=mydata[,2]

# plot lowess graph
logitloess(x,y)

The resulting plot is very similar to the one provided in the book (Figure 4.1). Its not exactly same, but this could be due to differences in the implementation of the logitloess methods between R and STATA. Nevertheless, the conclusions from the plot obtained in R are same as those in the book.

Sunday, February 11, 2018

SublimeText3: Gcc build system and termiantor

create new build system subl3 ~/.config/sublime-text-3/Packages/User/gcc.sublime-build with the contents of { "shell_cmd": "g++ \"${file}\" -o \"${file_path}/${file_base_name}\"", "file_regex": "^(..[^:]*):([0-9]+):?([0-9]+)?:? (.*)$", "working_dir": "${file_path}", "selector": "source.c, source.c++", "variants": [ { "name": "Run", "shell_cmd": "terminator -e 'gcc \"${file}\" -o \"${file_path}/${file_base_name}\" && \"${file_path}/${file_base_name}\";echo;echo; echo Press ENTER to continue; read line;exit; exec bash'" } ] } Based on https://stackoverflow.com/a/30724183/248823

Thursday, February 08, 2018

Arch: dell inspiron 1545 Broadcom Limited BCM4312

Have to install this driver: https://www.archlinux.org/packages/?name=broadcom-wl-dkms
sudo pacman -S linux-headers broadcom-wl-dkms



Then after reboot wlp12s0 device was found: ip link
1: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp9s0: mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether 00:25:64:47:bd:bb brd ff:ff:ff:ff:ff:ff
3: wlp12s0: mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen
1000
link/ether 00:22:5f:d3:14:d2 brd ff:ff:ff:ff:ff:ff

Tuesday, February 06, 2018

Arch: Wine and GPower

GPower 4.1 installs in wine 3.0 and runs, but freezes after executing calculations due to some problems with drawing the results's plot. To fix the freezing, need to install gdiplus and lib32-gnutls:
winetricks vcrun6 lib32-gnutls gdiplus
This fixes the freezes, although the plots can't be still seen.

Friday, February 02, 2018

Thursday, January 25, 2018

youtube-dl: download continue playlist

youtube-dl --download-archive downloaded.txt --no-post-overwrites -cwix --audio-format mp3