大约有 7,549 项符合查询结果（耗时：0.0151秒） [XML]
How can I determine whether a 2D Point is within a Polygon?
...1) of infinite length.
// We want the line in linear equation standard form: A*x + B*y + C = 0
// See: http://en.wikipedia.org/wiki/Linear_equation
a1 = v1y2 - v1y1;
b1 = v1x1 - v1x2;
c1 = (v1x2 * v1y1) - (v1x1 * v1y2);
// Every point (x,y), that solves the equation above, i...
What is LINQ and what does it do? [closed]
...ectly in their languages (such as C# and Visual Basic). The techniques for forming these queries do not rely on the implementation details of the thing being queried, so that you can write valid queries against many targets (databases, in-memory objects, XML) with practically no consideration of the...
Commenting multiple lines in DOS batch file
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Ooh, the square and curly bracket forms are sexy. If I were writing code only for myself I might use it. But I imagine the average user would see that and say WTF.
– dbenham
Oct 6 '17 at 13:55
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How to write very long string that conforms with PEP8 and prevent E501
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Note no plus sign, and I added the extra comma and space that follows the formatting of your example.
Personally I don't like the backslashes, and I recall reading somewhere that its use is actually deprecated in favor of this form which is more explicit. Remember "Explicit is better than implicit...
How to create multiple levels of indentation in Javadoc?
...some beginner will not understand Your comment and use the above-mentioned form.
– Rauni Lillemets
Apr 24 '14 at 7:35
2
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Is there a PHP function that can escape regex patterns before they are applied?
...ase I could come up with where it's actually being used to programatically form a regex and put it into another preg_* function (because otherwise, what's the point?). Feel free to rollback if you don't like the change.
– Mark Amery
Sep 21 '15 at 23:04
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What is a non-capturing group in regular expressions?
...o.
Well, groups serve many purposes. They can help you to extract exact information from a bigger match (which can also be named), they let you rematch a previous matched group, and can be used for substitutions. Let's try some examples, shall we?
Imagine you have some kind of XML or HTML (be awar...
Null coalescing in powershell
...these aren't very snappy, and nowhere near as comfortable to use as the C# forms.
You might also consider wrapping it in a very simple function to make things more readable:
function Coalesce($a, $b) { if ($a -ne $null) { $a } else { $b } }
$s = Coalesce $myval "new value"
or possibly as, IfNul...
Proper use of 'yield return'
... technique for using yield to write asynchronous code in a very serialized form.
– Kennet Belenky
Sep 11 '12 at 17:27
12
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Datatables: Cannot read property 'mData' of undefined
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FYI dataTables requires a well formed table. It must contain <thead> and <tbody> tags, otherwise it throws this error. Also check to make sure all your rows including header row have the same number of columns.
The following will throw error (...