xaratustrah

CST on Ubuntu

Installing 3DS CST Microwave Studio Suite Distributed Computing Node on Ubunntu

Tested on: Ubuntu 20.04.2 LTS nvidia version 470

nvidia + cuda installation

CUDA / PyCUDA and TensorFlow on Debian

Common commands used in package management systems

Pacman

Archlinux	Debian / Ubuntu
pacman -Sy	apt-get update
pacman -Syu	apt update + apt distpgrade
pacman -Ss	like apt-cache search
pacman -S PAKETNAME	apt-get install PAKETNAME

Python installation

PyPI how to

Check classifiers here https://pypi.python.org/pypi?%3Aaction=list_classifiers.

Create markdown:

pandoc --from markdown_github --to rst -o README.rst README.md

Shell scripts and one liners

Snippets, tips and tricks in no particular order. FOR ADVANCED USERS ONLY. Some of these one liners may be dangerous since they might delete files in loops. Please pay attention and make backups. :-)

Extracting a column from a text file

Extract the 10th column while skipping the first line:

awk -F ' ' 'NR!=1{print $10}' filename.txt

C/C++ tips & tricks

Pair in C++

#include <utility>
#include <iostream>
#include <math.h>
 
std::pair<double, double> cart2pol(double real, double imag)

{

Stand alone GUI OSX Application Bundle using ROOT Libraries

Here is how you can deploy a truly stand alone OSX application bundle out of a stand alone ROOT GUI application which you can distribute to other colleagues without a ROOT installation.

Libraries

First get ROOT from git and compile it as described in http://root.cern.ch/drupal/content/installing-root-source. You don't need to install it. After that make clean and make a duplicate copy of the whole root directory and name it e.g. root_runtime. In root_runtime, delete everything except the directories lib, icons, fonts, etc and bin. In the bin directory delete everything except the script thisroot.sh and root-config. Then go inside the lib directory and check for the dependencies of all libs to see if anyone depends on some library other than those in the /ur/lib, which come automatically with OSX. Specifically you can grep for any dependency that is in /opt/ for systems that have macports installed.

otool -L *

	# show number notation
	def get_number_notation(value, decimal_place=2, unit=''):
	ref = {24: 'Y', 21: 'Z', 18: 'E', 15: 'P',
	12: 'T', 9: 'G', 6: 'M', 3: 'k', 0: '',
	-3: 'm', -6: 'u', -9: 'n', -12: 'p',
	-15: 'f', -18: 'a', -21: 'z', -24: 'y',
	}
	num = max([key for key in ref.keys() if value > 10 ** key])
	mult = ref[num] if unit else 'e{}'.format(num)
	return '{}{}{}'.format(int(value / 10 ** num * 10 decimal_place) / 10 decimal_place, mult, unit)

	# taken from http://www.piware.de/2011/01/creating-an-https-server-in-python/
	# generate server.xml with the following command:
	# openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes
	# run as follows:
	# python simple-https-server.py
	# then in your browser, visit:
	# https://localhost:4443
	# Changed for python 3

	import http.server