turingbirds

Git cheatsheet

Set up Git

git config --global user.email "john_doe@example.com"
git config --global user.name "John Doe"

turingbirds

<?php

header("Content-Type: text/html; charset=utf-8");

function display_filesize($filesize) {
	if (is_numeric($filesize)) {
		$decr = 1024;
		$step = 0;
		$prefix = array('Byte','KB','MB','GB','TB','PB');

turingbirds

usbreset.c

Due to Alan Stern [1].

[1]	http://marc.info/?l=linux-usb&m=121459435621262&w=2

List your USB devices

turingbirds

#!/usr/bin/python
# -*- coding: utf-8 -*-
"""Execute a child program in a new process"""
import os
import subprocess



def exec_binary(cmd_line_list, cwd=None, stdout=None, stderr=None, verbose=False):
	"""Invoke an executable file.

turingbirds

GNUPG CHEATSHEET

Setting up: key generation

This generates a public/private keypair.

$ gpg --gen-key

$ gpg --list-secret-keys

turingbirds

/**
 * Compute the (Moore-Penrose) pseudo-inverse of a libgsl matrix in plain C.
 *
 * Compile uding:
 *
 *     gcc moore_penrose_pseudoinverse.c -lgsl -lblas
 *
 * Dependencies:
 * - libgsl (GNU Scientific Library) 
 * - libblas (Basic Linear Algebra Subprograms)

turingbirds

turingbirds

GPIB interfacing using Agilent 82357B on Ubuntu Linux

I initially had some problems installing on my laptop, so decided to boot Ubuntu 12.04.5 LTS, 3.13.0-32-generic from USB and work from there.

For an automated installation script, see gpib_install.sh (and gpib.conf) below. The rest of this document describes the actions of the installation script step-by-step.

First, get the packages that are necessary to support Python bindings:

turingbirds

ltspice options for high precision simulation/data export

Uses backward Euler integration (maxord=1 option), which can be very slow.

Set maximum iteration counts: DC iteration count limit (itl1, default: 100), DC transfer curve iteration count limit (itl2, default: 50), and transient analysis time point iteration count limit (itl4, default: 10) [ltwiki]_.

.OPTIONS maxord=1

turingbirds