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Calculate distance between two latitude-longitude points? (Haversine formula)
...s surface – using the
‘Haversine’ formula.
function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {
var R = 6371; // Radius of the earth in km
var dLat = deg2rad(lat2-lat1); // deg2rad below
var dLon = deg2rad(lon2-lon1);
var a =
Math.sin(dLat/2) * Math.sin(dLat/2) +
Ma...
Legality of COW std::string implementation in C++11
...) (and on every return of pointer, reference, or iterator) does not suffer from that problem. I.e. (invariant) a buffer is at any time unshared, or else shared with no external refs. I thought you had intended the comment about this example as an informal bug report-as-a-comment, very sorry for misu...
How to convert unix timestamp to calendar date moment.js
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UNIX timestamp it is count of seconds from 1970, so you need to convert it to JS Date object:
var date = new Date(unixTimestamp*1000);
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What is a “Bitmap heap scan” in a query plan?
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The best explanation comes from Tom Lane, which is the algorithm's author unless I'm mistaking. See also the wikipedia article.
In short, it's a bit like a seq scan. The difference is that, rather than visiting every disk page, a bitmap index scan AND...
How to make a variadic macro (variable number of arguments)
...VA_ARGS__) does the job the portable way; the fmt parameter can be omitted from the definition.
– alecov
Jun 11 '12 at 20:14
4
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Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?
...when the scale is 1.0? because I see that you draw an baseImage (the image from the bg worker?) before you create the transform.
– Luke Mcneice
Oct 10 '10 at 14:15
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Convert one date format into another in PHP
...n't recognize the y-m-d-h-i-s format.
PHP 5.3 and up
Use DateTime::createFromFormat. It allows you to specify an exact mask - using the date() syntax - to parse incoming string dates with.
PHP 5.2 and lower
You will have to parse the elements (year, month, day, hour, minute, second) manually usi...
How do I center align horizontal menu?
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From http://pmob.co.uk/pob/centred-float.htm:
The premise is simple and basically just involves a widthless float wrapper that is floated to the left and then shifted off screen to the left width position:relative; left:-50%...
Good open source django project for learning [closed]
...d tricks by reading their source. It is definitely a good example to learn from.
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Choosing the default value of an Enum type without having to change values
...S 1. No, but admitting you were wrong is. 2. He didn't earn any reputation from comment upvotes.
– Aske B.
Nov 23 '12 at 13:01
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