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How to clone a case class instance and change just one field in Scala?
...It turns out it is just a few lines of code in the scalaz library:
/** http://stackoverflow.com/a/5597750/329496 */
case class Lens[A, B](get: A => B, set: (A, B) => A) extends ((A) => B) with Immutable {
def apply(whole: A): B = get(whole)
def mod(a: A, f: B => B) = set(a...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...om scipy.spatial.distance import cdist # $scipy/spatial/distance.py
# http://docs.scipy.org/doc/scipy/reference/spatial.html
from scipy.sparse import issparse # $scipy/sparse/csr.py
__date__ = "2011-11-17 Nov denis"
# X sparse, any cdist metric: real app ?
# centres get dense rapidly,...
Get keys from HashMap in Java
...
Check this.
https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html
(Use java.util.Objects.equals because HashMap can contain null)
Using JDK8+
/**
* Find any key matching a value.
*
* @param value The value to be matched...
Get the latest record from mongodb collection
...option $natural is not supported' on server docdb. Hopefully that feature comes soon.
– Marc
Apr 12 '19 at 18:58
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Is there a performance difference between a for loop and a for-each loop?
...and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
applies equally to collections and
arrays:
// The preferred idiom for iterating over collections and arrays
for (Element e : elements) {
doSomething(e);
}
When you see the colon ...
How to drop unique in MySQL?
... for that
ALTER TABLE `products` DROP INDEX `PRIMARY`;
Code Taken from: http://chandreshrana.blogspot.in/2015/10/how-to-remove-unique-key-from-mysql.html
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What is the difference between Int and Integer?
...itrary precision integers, with
range as large as you have memory for.
https://mail.haskell.org/pipermail/haskell-cafe/2005-May/009906.html
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`Apache` `localhost/~username/` not working
... libexec/apache2/mod_userdir.so
and
#Include /private/etc/apache2/extra/httpd-userdir.conf
Then in httpd-userdir.conf you may need to uncomment:
#Include /private/etc/apache2/users/*.conf
Lastly you would need to create /private/etc/apache2/users/kevin.conf if it doesn't exist. I think it s...
Do zombies exist … in .NET?
... }
Console.ReadLine();
}
//Borrowed from here
//http://stackoverflow.com/a/13001749/969613
public static long FindPrimeNumber(int n)
{
int count = 0;
long a = 2;
while (count < n)
{
long b = 2;
int prime = ...
jQuery find events handlers registered with an object
...
blog.jquery.com/2011/11/08/building-a-slimmer-jquery .data(“events”): jQuery stores its event-related data in a data object named (wait for it) events on each element. This is an internal data structure so in 1.8 this will be removed...