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What exactly is nullptr?
... overload on nullptr_t so that ptr<T> p(42); would be a compile-time error rather than a run-time assert.
ptr(std::nullptr_t) : p_(nullptr) { }
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Showing a different background colour in Vim past 80 characters
...
try:
:/\%>80v./+
it will mark +80 characters as error
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Calculating distance between two points, using latitude longitude?
... code given by Dommer above gives slightly incorrect results but the small errors add up if you are processing say a GPS track. Here is an implementation of the Haversine method in Java which also takes into account height differences between two points.
/**
* Calculate distance between two points...
How to make a flat list out of list of lists?
...of the sum (if not given, 0 is used instead and this case will give you an error).
Because you are summing nested lists, you actually get [1,3]+[2,4] as a result of sum([[1,3],[2,4]],[]), which is equal to [1,3,2,4].
Note that only works on lists of lists. For lists of lists of lists, you'll need ...
Quick Way to Implement Dictionary in C
...ion, it's hard to beat naively searching through an array. Aside from some error checking, this is a complete implementation (untested).
typedef struct dict_entry_s {
const char *key;
int value;
} dict_entry_s;
typedef struct dict_s {
int len;
int cap;
dict_entry_s *entry;
} di...
How to generate a random integer number from within a range
...rand() == RAND_MAX, or rand() is very close to RAND_MAX and floating-point errors push the final result past max + 1. To be safe, you should check that the result is within range before returning it.
– Mark Dickinson
Mar 24 '10 at 17:06
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String's Maximum length in Java - calling length() method
... in a hello world java program which was longer than 65546. javac gives an error about that literal being too long: javac HelloWorld.java 2>&1|head -c 80 HelloWorld.java:3: constant string too long
– dlamblin
Jul 15 '11 at 19:59
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How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
...r
<?php /*
Author: Luis Siquot
Purpose: Check ajax performance and errors
License: GPL
site5: Please don't drop json requests (nor delay)!!!!
*/
$r = (int)$_GET['r'];
$w = (int)$_GET['w'];
if($r) {
sleep($w);
echo json_encode($_GET);
die ();
} //else
?><head>
<sc...
How to set a single, main title above all the subplots with Pyplot?
...ot plt.subtitle(). I did not realize this in the beginning and got a nasty error! :D
– Dataman
May 10 '16 at 15:40
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What are advantages of Artificial Neural Networks over Support Vector Machines? [closed]
...of ( y - U(x,aa) )^{2}
Let me explain why, if you select aa such that the error is minimized, then for a rare set of values you have perfect fit. However, since they are rare the average is never 0. You want to minimize the second although you have a discrete approximation to D. And keep in mind th...