teamon

f(x) = a*x + b
set terminal png size 1024,768
set xlabel "I [mA]"
set ylabel "U [V]"
set title "U=f(I)"

fit f(x) "rc.dat" via a,b
set output "rc.png"
plot f(x) notitle, "rc.dat" notitle with xyerrorbars ls 3

teamon

Laboratorium 2 - 9.11.2010 - korelacja

Korelacja - podobieństwo dwóch zjawisk (np. sygnalow, jak jeden jest podobny do drugiego)

Korelacja wzajemna (dla 2), autokorelacja (dla 1)

R_{xx}(\tau) = E[x(t)x(t+\tau)]

R_{x,y}(\tau) = E[x(t)y(t+\tau)]

teamon

Laboratorum nr 3 - 23.11.2010 - Probkowanie i kwantowanie

1. Probkowanie
sinus
a) fpr > 2*f
b) fpr == 2*f
c) fpr < f

Jak wyglada sygnal w dziedzinie czasu i czestotliwosci?

teamon

# Tabela przejsc miedzy stanami
# q(t) z(t) q(t+1)
0 0 3
0 1 1
0 2 2
1 0 1
1 1 1
1 2 1
2 0 5
2 1 1

teamon

Dyskretna transformata Fouriera

1. sinus
wyznaczyc widmo dla sygnalu ktory 
a) w n probkach bedzie mial calkowita liczbe okresow
b) w n probkach bedzie mial niecalkowita liczbe okresow
fft/g + semilogy -> widmo

2. dyskretna transformata Fouriera (probkowanie widma ciaglego)
a) f_sin \in m*fpr/N, m \in {0,1,..,N-1}

threetee

#!/bin/sh
set -e

APP=$1
APP_PATH="/srv/${APP}/current"
RAILS_ENV=$2
UNICORN_CONFIG="/etc/unicorn/${APP}.rb"

UNICORN_PID_FILE="/tmp/unicorn.${APP}.pid"

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

return1

#
# UPDATE for 10.10.4+: please consider this patch obsolete, as apple provides a tool called "trimforce" to enable trim support for 3rd party SSDs
# just run "sudo trimforce enable" to activate the trim support from now on!
#
# Original version by Grant Parnell is offline (http://digitaldj.net/2011/07/21/trim-enabler-for-lion/)
# Update July 2014: no longer offline, see https://digitaldj.net/blog/2011/11/17/trim-enabler-for-os-x-lion-mountain-lion-mavericks/
#
# Looks for "Apple" string in HD kext, changes it to a wildcard match for anything
#
# Alternative to http://www.groths.org/trim-enabler-3-0-released/

mlen

def self.method_missing(name, *args)
  name
end

def function(*param_names, &block)
  klass = Class.new { attr_accessor :this, *param_names }
  this  = TOPLEVEL_BINDING.eval('self')

  proc do |*params|
    context = klass.new

twneale

'''
Save this file and add the following line to your ~/.bashrc"

export PYTHONSTARTUP="$HOME/.pythonrc"
'''
import os
import readline
import rlcompleter
import atexit