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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...Core 2 Duo T7500 @ 2.4GHz, 4MB L2 Cache; YMMV. I used gcc 4.3.2 on 64-bit Linux. OpenMP (and the GCC bindings) were used for high-resolution timers.
reverse.c
#include <stdlib.h>
#include <stdio.h>
#include <omp.h>
unsigned int
reverse(register unsigned int x)
{
x = (((x &...
Regular expression to match numbers with or without commas and decimals in text
...derstand and correct the deficiency.
I apologize for this code written in Python, but regexes are trans-langage and I think everybody will be capable of undertsanding the reex's pattern
import re
regx = re.compile('(?<![\d.])(?!\.\.)(?<![\d.][eE][+-])(?<![\d.][eE])(?<!\d[.,])'
...
What is the maximum length of a URL in different browsers?
...T CLR 3.0.30729; .NET4.0C; .NET4.0E)
2505
Android Emulator
Mozilla/5.0 (Linux; Android 5.1; Android SDK built for x86 Build/LKY45) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/39.0.0.0 Mobile Safari/537.36
7377
Internet Explorer 11
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1...
Daylight saving time and time zone best practices [closed]
...often a better choice than DateTime.
If using Perl, use DateTime.
If using Python, use pytz or dateutil.
If using JavaScript, use moment.js with the moment-timezone extension.
If using PHP > 5.2, use the native time zones conversions provided by DateTime, and DateTimeZone classes. Be careful when...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...n my Xeon W3520. You can verify that the program works using the following Python script, assuming a program name of sort1mb.exe.
from subprocess import *
import random
sequence = [random.randint(0, 99999999) for i in xrange(1000000)]
sorter = Popen('sort1mb.exe', stdin=PIPE, stdout=PIPE)
for val...
Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?
...o a process. in fact threads won;t show up in your windows task manager or linux top command. once again they are more little weight then processes
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What and where are the stack and heap?
...
It's not just C. Java, Pascal, Python and many others all have the notions of static versus automatic versus dynamic allocation. Saying "static allocation" means the same thing just about everywhere. In no language does static allocation mean "not dynamic"...
How to sort my paws?
...
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A simple explanation of Naive Bayes Classification
...,no
Here is the code the comments explains everything we are doing here! [python]
import pandas as pd
import pprint
class Classifier():
data = None
class_attr = None
priori = {}
cp = {}
hypothesis = None
def __init__(self,filename=None, class_attr=None ):
self.d...
lexers vs parsers
...efine it as just '\n' to end the instruction with the end of line, like in Python. But the syntax of instruction (and the parser) stays unchanged :-) Only lexer needs to be changed.
– SasQ
Aug 2 '12 at 1:08
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