A script to plot GWL File (for the use of Nanoscribe)

Jice — Wed, 17 Nov 2010 09:54:14 +0000

The focus of this article is really small. It will only interest people involved in Research, who own a Nanoscribe device.

I was a little bit annoyed by the software, very heavy, and running only on windows. I wanted to design my structures on Linux (or any plateform actually), and I wanted to plot the result with a light software.

I programmed a small script in Python to plot 2D structures written in gwl. In order to run it, ou need to have Python 2.6, Matplotlib and SciPy (in order to have Numpy functions). You also have to use the preamble module I use and which is also included in the archive.

To use it, put the module, the script and the GWL file in the same folder. Then modify the script and include the name of your gwl file. Finally, open a consol, and type :

python plot_gwl.py

You can modify and improve this small script, and I would be happy to see the modifications (probably 3D would be a good step forward).

Download the archive : Plot_GWL.1.0.zip (contains the script to plot and the module)

Edit 22 Nov. 2010 : I implemented the 3D visualization . The same command is required to use it (modify line 26 "open('your_filename.gwl','r')" ) . Comments have been added to help you understading the script. A future addition will take in account an input parameter (instead of modifing the script every time to tell it which file to plot).

Download the new archive : Plot_GWL.1.1.zip

Example of a 3D plot :

Python et Google PageRank

Jice — Thu, 02 Jul 2009 05:14:31 +0000

Suite à mes recherches pour trouver un script de calcul de Pagerank en python, je souhaitais vous présenter deux pages qui me sont tombées sous les yeux.

Script de vérification de Pagerank en Python :

Ce script permet d'aller chercher la valeur de Pagerank Google d'un site donné en argument. Cela sert pour toutes sortes de choses dans le monde du SEO. La page en question est là :

http://blogmag.net/blog/read/91/Python_code_to_check_your_Google_PageRank

Testé aujourd'hui (1er Juillet 2009), le script fonctionne parfaitement bien. Ceux que j'ai pu trouver en php ne marchaient pas ( google me considère comme un pirate vous savez). Si vous en possédez en PHP, je suis preneur

Script de calcul de PageRank ( Google-like)

La page suivante se base sur un article publié à l'AMS, mais dont le principe ne décrit pas exactement le fonctionnement de Google.

Le script écrit en python tente de reproduire le fonctionnement d'un algorithme de Pagerank. Je ne l'ai pas testé, mais ça peut interesser du monde :

http://www.eioba.com/a69792/the_google_pagerank_algorithm_in_126_lines_of_python

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# (C) 2008 Fred Cirera
# ported in Python from the Ruby code by Vsevolod S. Balashov
# http://snippets.dzone.com/posts/show/3284

import urllib2
import re
import time
import sys

from urllib import urlencode
from pprint import pprint

HOST = "toolbarqueries.google.com"

def mix(a, b, c):
    M = lambda v: v % 0x100000000 # int32 modulo
    a, b, c = (M(a), M(b), M(c))

    a = M(a-b-c) ^ (c >> 13)
    b = M(b-c-a) ^ (a <<  8)
    c = M(c-a-b) ^ (b >> 13)

    a = M(a-b-c) ^ (c >> 12)
    b = M(b-c-a) ^ (a << 16)
    c = M(c-a-b) ^ (b >> 5)

    a = M(a-b-c) ^ (c >>  3)
    b = M(b-c-a) ^ (a << 10)
    c = M(c-a-b) ^ (b >> 15)

    return a, b, c

def checksum(iurl):
    C2I = lambda s: sum(c << 8*i for i, c in enumerate(s[:4]))
    a, b, c = 0x9e3779b9, 0x9e3779b9, 0xe6359a60
    lg  = len(iurl)
    k = 0
    while k <= lg-12:
        a = a + C2I(iurl[k:k+4])
        b = b + C2I(iurl[k+4:k+8])
        c = c + C2I(iurl[k+8:k+12])
        a, b, c = mix(a, b, c)
        k += 12

    a = a + C2I(iurl[k:k+4])
    b = b + C2I(iurl[k+4:k+8])
    c = c + (C2I(iurl[k+8:])<<8) + lg
    a, b, c = mix(a, b, c)
    return c

def GoogleHash(value):
    I2C = lambda i: [i & 0xff, i >> 8 & 0xff,  i >> 16 & 0xff, i >> 24 & 0xff]
    ch = checksum([ord(c) for c in value])
    ch = ((ch % 0x0d) & 7) | ((ch/7) << 2)
    return "6%s" % checksum(sum((I2C(ch-9*i) for i in range(20)), []))

def make_url(host, site_url):
    url = "info:" + site_url
    params = dict(client="navclient-auto", ch="%s" % GoogleHash(url),
                  ie="UTF-8", oe="UTF-8", features="Rank", q=url)
    return "http://%s/search?%s" % (host, urlencode(params))

# Where the fun begins

if __name__ == "__main__":
    if len(sys.argv) != 2:
        url = 'http://www.google.com/'
    else:
        url = sys.argv[1]

    if not url.startswith('http://'):
        url = 'http://%s' % url

    # print make_url(HOST, url)
    req = urllib2.Request(make_url(HOST, url))
    try:
        f = urllib2.urlopen(req)
        response = f.readline()
    except Exception, err:
        print err
        # print err.read()
        sys.exit(1)

    try:
        rank = re.match(r'^Rank_\d+:\d+:(\d+)', response.strip()).group(1)
    except AttributeError:
        print "This page is not ranked"
        rank = -1

    print "PagerRank: %d\tURL: %s" % (int(rank), url)

Blog de Jean-Christophe Lavocat » Python

A script to plot GWL File (for the use of Nanoscribe)

Python et Google PageRank

Script de vérification de Pagerank en Python :

Script de calcul de PageRank ( Google-like)