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Algorithm to find Largest prime factor of a number
...factorisation. It makes use of the identity N = (a + b)(a - b) = a^2 - b^2 and is easy to understand and implement. Unfortunately it's not very fast in general.
The best known method for factoring numbers up to 100 digits long is the Quadratic sieve. As a bonus, part of the algorithm is easily done...
JSON serialization of Google App Engine models
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A simple recursive function can be used to convert an entity (and any referents) to a nested dictionary that can be passed to simplejson:
import datetime
import time
SIMPLE_TYPES = (int, long, float, bool, dict, basestring, list)
def to_dict(model):
output = {}
for key, prop...
How to get full path of a file?
... @J0hnG4lt: that's because you installed coreutils with homebrew and changed your PATH to point to the unprefixed binaries. Installing coreutils, leaving PATH alone, and using "greadlink" would work as well.
– Tim Smith
Jul 25 '14 at 20:43
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What is Delegate? [closed]
...til runtime. So you use a "delegate" for that purpose. Delegates come in handy for things like event handlers, and such, where you do different things based on different events, for example.
Here's a reference for C# you can look at:
In C#, for example, let's say we had a calculation we wanted to...
Combine --user with --prefix error with setup.py install
...e advantage of Python's relatively new per user site-packages directory , and the new option --user . (The option is currently undocumented , however it exists for Python 2.6+; you can see the help by running python setup.py install --help .)
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Should I use Vagrant or Docker for creating an isolated environment? [closed]
I use Ubuntu for development and deployment and have a need for creating an isolated environment.
10 Answers
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Android Studio: Android Manifest doesn't exists or has incorrect root tag
I got this error on Android Studio (AS):
11 Answers
11
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java get file size efficiently
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Well, I tried to measure it up with the code below:
For runs = 1 and iterations = 1 the URL method is fastest most times followed by channel. I run this with some pause fresh about 10 times. So for one time access, using the URL is the fastest way I can think of:
LENGTH sum: 10626, per It...
Call Go functions from C
...hould make things a little clearer.
package foo
// extern int goCallbackHandler(int, int);
//
// static int doAdd(int a, int b) {
// return goCallbackHandler(a, b);
// }
import "C"
//export goCallbackHandler
func goCallbackHandler(a, b C.int) C.int {
return a + b
}
// This is the public ...
Comparing date part only without comparing time in JavaScript
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I'm still learning JavaScript, and the only way that I've found which works for me to compare two dates without the time is to use the setHours method of the Date object and set the hours, minutes, seconds and milliseconds to zero. Then compare the two dat...