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What is an NP-complete in computer science?
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What is NP?
NP is the set of all decision problems (questions with a yes-or-no answer) for which the 'yes'-answers can be verified in polynomial time (O(nk) where n is the problem size, and k is a constant) by a deterministic Turing machine. Polyn...
Programmatically change log level in Log4j2
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EDITED according to log4j2 version 2.4 FAQ
You can set a logger’s level with the class Configurator from Log4j Core. BUT be aware that the Configurator class is not part of the public API.
// org.apache.logging.log4j.core.config.Configurator;
Configurator.setLevel("com.exa...
How to crop an image in OpenCV using Python
How can I crop images, like I've done before in PIL, using OpenCV.
8 Answers
8
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Passing parameters to a Bash function
I am trying to search how to pass parameters in a Bash function, but what comes up is always how to pass parameter from the command line.
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Correct way to load a Nib for a UIView subclass
...bject;
}
Normally, in the TopArea.xib, you would click on File Owner and set the file owner to YourClass. Then actually in YourClass.h you would have IBOutlet properties. In TopArea.xib, you can drag controls to those outlets.
Don't forget that in TopArea.xib, you may have to click on the View it...
Replace comma with newline in sed on MacOS?
I have a file of id's that are comma separated. I'm trying to replace the commas with a new line. I've tried:
13 Answers
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UISegmentedControl below UINavigationbar in iOS 7
...a segment in a toolbar. Place this toolbar right below the navigation bar. Set the delegate of the toolbar to your view controller, and return UIBarPositionTopAttached in positionForBar:. You can see in the store app, if you perform an interactive pop gesture, that the segment bar does not move the ...
Set 4 Space Indent in Emacs in Text Mode
...ize-variable (quote tab-stop-list))
or add tab-stop-list entry to custom-set-variables in .emacs file:
(custom-set-variables
;; custom-set-variables was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
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How do I check if the Java JDK is installed on Mac?
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Returns the path to a Java home directory from the current user's settings.
Options:
[-v/--version <version>] Filter Java versions in the "JVMVersion" form 1.X(+ or *).
[-a/--arch <architecture>] Filter JVMs matching architecture (i386, x86_64, etc).
[...
Correct way to define Python source code encoding
...g: UTF-8" matches.
PEP provides some examples:
#!/usr/bin/python
# vim: set fileencoding=<encoding name> :
# This Python file uses the following encoding: utf-8
import os, sys
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