ruthenium

/**
 * Coordinates Transformations
 *
 * http://stackoverflow.com/questions/5736398/how-to-calculate-the-svg-path-for-an-arc-of-a-circle
 *
 * @param centerX
 * @param centerY
 * @param radius
 * @param angleInDegrees
 * @returns {string}

ruthenium

function cartesianToPolar(x,y){
    return {
        radius: Math.sqrt( Math.pow(x, 2) + Math.pow(y, 2) ),
        alpha: Math.atan2(y, x)
    }
}

ruthenium

function polarToCartesian(radius,radian){
    return {
        x:radius*Math.cos(radian),
        y:radius*Math.sin(radian)
    }
}

ruthenium

// thx tomy! http://www5.airnet.ne.jp/tomy/cpro/sslib12.htm

function cartesian2polar(x,y,z) {
    var obj = new Object;
    obj.r = Math.sqrt( x*x + y*y + z*z );
    
    if (x != 0.0)
        obj.phi = Math.atan2( y, x );
    else {
        if (y < 0.0)

ruthenium

import Data.Vector ((!))
import qualified Data.Vector as V
import Data.Vector.Generic.Mutable (write)

step ws state = case updatable of []      -> state
                                  (i,_):_ -> V.modify (\v -> write v i (o i)) state
  where
    n     = V.length state
    w i j = ws ! i ! j

ruthenium

# Find tutorial;
# http://www.grymoire.com/Unix/Find.html

# find files modified less than 5 days ago
$ find . -type f -mtime -5 -print | xargs ls -l

# find files (with spaces in name) modified less than 5 days ago 
$ find . -type f -mtime -5 -print0 | xargs -0 ls -l

# find & remove directories older than 200 days

ruthenium

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=finished.pdf file1.pdf file2.pdf

# found at https://bbs.archlinux.org/viewtopic.php?id=65036

# some automation (merge all in current directory):
find . -type f -print0 | xargs -0 gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile="/path/finished.pdf"

ruthenium

zip -r [filename.zip] [foldername] -x "*.DS_Store" -x *.git*

ruthenium

#!/bin/bash

if [ $# -ne 1 ]; then
	echo "Usage: ${0} directory"
	exit 1
fi

if [ -d ${1} ]; then
	DIR_NAME=$(basename ${1})

ruthenium

zip -d archive.zip "*/*.DS_Store"