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Test for equality among all elements of a single vector
...ich compares the min and the max, after dividing by the mean:
# Determine if range of vector is FP 0.
zero_range <- function(x, tol = .Machine$double.eps ^ 0.5) {
if (length(x) == 1) return(TRUE)
x <- range(x) / mean(x)
isTRUE(all.equal(x[1], x[2], tolerance = tol))
}
If you were usin...
Identify duplicates in a List
...e method add of Set returns a boolean whether a value already exists (true if it does not exist, false if it already exists, see Set documentation).
So just iterate through all the values:
public Set<Integer> findDuplicates(List<Integer> listContainingDuplicates)
{
final Set<Inte...
What characters do I need to escape in XML documents?
...
If you use an appropriate class or library, they will do the escaping for you. Many XML issues are caused by string concatenation.
XML escape characters
There are only five:
" &quot;
' &apos;
< &lt;
&g...
Is it possible to make an ASP.NET MVC route based on a subdomain?
...xt.Request.Headers["HOST"];
var index = url.IndexOf(".");
if (index < 0)
return null;
var subDomain = url.Substring(0, index);
if (subDomain == "user1")
{
var routeData = new RouteData(this, new MvcRouteHandler());
rou...
How to convert a file into a dictionary?
... for line in open("file.txt"): do cleanup the same way. And if f is a local value the f is released when the scope is lost. The only case where this statement is useful is for long function (not good for quality), or if you use a global variable.
– VGE
...
Remove HTML tags from a String
... removing HTML tags against a customizable whitelist, which is very useful if you want to allow only e.g. <b>, <i> and <u>.
See also:
RegEx match open tags except XHTML self-contained tags
What are the pros and cons of the leading Java HTML parsers?
XSS prevention in JSP/Servlet w...
Static class initializer in PHP
...in the class require a ‘heavy’ initialization function to run once (as if it were a constructor).
8 Answers
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add a string prefix to each value in a string column using Pandas
...
thank you. if of interest, dataframe indexes also support such string manipulations.
– tagoma
Jul 10 '17 at 21:30
2
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How do I return early from a rake task?
I have a rake task where I do some checks at the beginning, if one of the checks fails I would like to return early from the rake task, I don't want to execute any of the remaining code.
...
How to try convert a string to a Guid [duplicate]
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Specifically, a GUIDConverter, which is built in. msdn.microsoft.com/en-us/library/…
– Joseph Ferris
Dec 8 '08 at 19:11
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