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Cluster analysis in R: determine the optimal number of clusters
Being a newbie in R, I'm not very sure how to choose the best number of clusters to do a k-means analysis. After plotting a subset of below data, how many clusters will be appropriate? How can I perform cluster dendro analysis?
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What is the logic behind the “using” keyword in C++?
What is the logic behind the "using" keyword in C++?
1 Answer
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Strip HTML from strings in Python
When printing a line in an HTML file, I'm trying to find a way to only show the contents of each HTML element and not the formatting itself. If it finds '<a href="whatever.com">some text</a>' , it will only print 'some text', '<b>hello</b>' prints 'hello', etc. How would o...
Coroutine vs Continuation vs Generator
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I'll start with generators, seeing as they're the simplest case. As @zvolkov mentioned, they're functions/objects that can be repeatedly called without returning, but when called will return (yield) a value and then suspend their execution. When they're called again...
Exploitable PHP functions
I'm trying to build a list of functions that can be used for arbitrary code execution. The purpose isn't to list functions that should be blacklisted or otherwise disallowed. Rather, I'd like to have a grep -able list of red-flag keywords handy when searching a compromised server for back-doors.
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Difference between Observer, Pub/Sub, and Data Binding
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Here's my take on the three:
Data Binding
Essentially, at the core this just means "the value of property X on object Y is semantically bound to the value of property A on object B. No assumptions are made as to how Y knows or is f...
Looking for a clear definition of what a “tokenizer”, “parser” and...
...lear definition of what a "tokenizer", "parser" and "lexer" are and how they are related to each other (e.g., does a parser use a tokenizer or vice versa)? I need to create a program will go through c/h source files to extract data declaration and definitions.
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iOS 7 status bar back to iOS 6 default style in iPhone app?
In iOS 7 the UIStatusBar has been designed in a way that it merges with the view like this:
25 Answers
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How to write the Fibonacci Sequence?
I had originally coded the program wrongly. Instead of returning the Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 should = only those numbers between 1 & 20), I have written for the program to display all Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 displa...
Why not be dependently typed?
I have seen several sources echo the opinion that "Haskell is gradually becoming a dependently-typed language". The implication seems to be that with more and more language extensions, Haskell is drifting in that general direction, but isn't there yet.
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