turingbirds

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

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.

Download the linux-gpib package, unpack and build. Get python-setuptools first for later Python bindings support.

wget --content-disposition --no-check-certificate https://sourceforge.net/projects/linux-gpib/files/linux-gpib%20for%203.x.x%20and%202.6.x%20kernels/3.2.20/linux-gpib-3.2.20.tar.gz/download

turingbirds

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/**
 * 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)

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GNUPG CHEATSHEET

Setting up: key generation

This generates a public/private keypair.

$ gpg --gen-key
$ gpg --list-secret-keys

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

usbreset.c

Due to Alan Stern [1].

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

List your USB devices

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<?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

Git cheatsheet

Set up Git

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