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Java recursive Fibonacci sequence
...fibonacci(3) = 1+1 = 2
fibonacci(4) = 2+1 = 3
fibonacci(5) = 3+2 = 5
And from fibonacci sequence 0,1,1,2,3,5,8,13,21.... we can see that for 5th element the fibonacci sequence returns 5.
See here for Recursion Tutorial.
s...
How to check if there exists a process with a given pid in Python?
...to check to see if a pid corresponds to a valid process? I'm getting a pid from a different source other than from os.getpid() and I need to check to see if a process with that pid doesn't exist on the machine.
...
What are the advantages of using nullptr?
...ro defined in certain standard library header files.
The origin of NULL is from C and C++ inherited it from C. The C standard defined NULL as 0 or (void *)0. But in C++ there is a subtle difference.
C++ could not accept this specification as it is. Unlike C, C++ is a strongly typed language (C does...
Difference: std::runtime_error vs std::exception()
... of the term).
std::runtime_error is a more specialized class, descending from std::exception, intended to be thrown in case of various runtime errors. It has a dual purpose. It can be thrown by itself, or it can serve as a base class to various even more specialized types of runtime error exceptio...
Converting a column within pandas dataframe from int to string
... This is appealing, but it is about 4x slower than apply(str) from @Jeff, in my test using pd.Series(np.arange(1000000)).
– John Zwinck
Aug 1 '16 at 22:01
2
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docker mounting volumes on host
...lumes (effectively sharing them between containers) by using the --volumes-from command when you run a container.
The fundamental difference between VOLUME and -v is this: -v will mount existing files from your operating system inside your docker container and VOLUME will create a new, empty volume...
Generate a Hash from string in Javascript
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About half of the answers are the same String.hashCode function taken from Java. It is ancient (from Gosling Emacs, 1981), extremely weak, and performance-wise, it makes zero sense in modern JavaScript. In fact, hashCode is significantly faster by using ES6 Math.imul, but no one took notice. We...
getResourceAsStream() vs FileInputStream
...java.io are dependent on the current working directory. I.e. the directory from which the JVM (in your case: the webserver's one) is started. This may for example be C:\Tomcat\bin or something entirely different, but thus not C:\Tomcat\webapps\contextname or whatever you'd expect it to be. In a norm...
Fast Bitmap Blur For Android SDK
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For future Googlers, here is an algorithm that I ported from Quasimondo. It's kind of a mix between a box blur and a gaussian blur, it's very pretty and quite fast too.
Update for people encountering the ArrayIndexOutOfBoundsException problem : @anthonycr in the comments provides...
How do I integrate Ajax with Django applications?
...eive. You'll also need to understand some basic JavaScript syntax (not far from python, you'll get used to it). I strongly recommend Envato's video tutorials for jQuery, they are great and will put you on the right path.
When to use JSON?. You're going to see a lot of examples where the data sent by...