banksean

// Ported from Stefan Gustavson's java implementation
// http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
// Read Stefan's excellent paper for details on how this code works.
//
// Sean McCullough banksean@gmail.com

/**
 * You can pass in a random number generator object if you like.
 * It is assumed to have a random() method.
 */

hadley

ks.default <- function(rows) seq(2, max(3, rows %/% 4))

many_kmeans <- function(x, ks = ks.default(nrow(x)), ...) {
  ldply(seq_along(ks), function(i) {
    cl <- kmeans(x, centers = ks[i], ...)
    data.frame(obs = seq_len(nrow(x)), i = i, k = ks[i], cluster = cl$cluster)
  })
}

all_hclust <- function(x, ks = ks.default(nrow(x)), point.dist = "euclidean", cluster.dist = "ward") {

drewconway

# Get StackOverflow data
get.stack<-function(tok) {
    # Must check for XML install, thanks onertipaday!
    if (!require(XML)) install.packages('XML')
    library(XML)
    # Enter a SO tag as character string, and number of tags are returned
    tok<-gsub("(/| )","-",tok)
    tok<-gsub("#","%23",tok,fixed=TRUE)
    base.stack<-"http://stackoverflow.com/questions/tagged/"
    stack.tree<-htmlTreeParse(paste(base.stack,tok,sep=""),useInternalNodes=TRUE)

senko

#!/bin/bash
#
# Watch current directory (recursively) for file changes, and execute
# a command when a file or directory is created, modified or deleted.
#
# Written by: Senko Rasic <senko.rasic@dobarkod.hr>
#
# Requires Linux, bash and inotifywait (from inotify-tools package).
#
# To avoid executing the command multiple times when a sequence of

johan

Click "raw" below to install. Requires Google Chrome, Firefox + Greasemonkey, or some other browser supporting user scripts / content scripts / user javascript.

leipzig

function mycd()
{
    #if this directory is writable then write to directory-based history file
    #otherwise write history in the usual home-based history file                    
    tmpDir=$PWD
    echo "#"`date '+%s'` >> $HISTFILE
    echo $USER' has exited '$PWD' for '$@ >> $HISTFILE
    builtin cd "$@" # do actual cd
    if [ -w $PWD ]; then export HISTFILE="$PWD/.dir_bash_history"; touch $HISTFILE; chmod --silent 777 $HISTFILE;
    else export HISTFILE="$HOME/.bash_history";

zed

#cython: boundscheck=False, wraparound=False
import  numpy as np
cimport numpy as np

from cython.parallel cimport prange

def dot(np.ndarray[np.float32_t, ndim=2] a not None,
        np.ndarray[np.float32_t, ndim=2] b not None,
        np.ndarray[np.float32_t, ndim=2] out=None):
    """Naive O(N**3) 2D np.dot() implementation."""

masak

Ok, I geeked out, and this is probably more information than you need. But it completely answers the question. Sorry. ☺

Locally, I'm at this commit:

$ git show
commit d6cd1e2bd19e03a81132a23b2025920577f84e37
Author: jnthn <jnthn@jnthn.net>
Date:   Sun Apr 15 16:35:03 2012 +0200

When I added FIRST/NEXT/LAST, it was idiomatic but not quite so fast. This makes it faster. Another little bit of masak++'s program.

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname