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Select multiple columns in data.table by their numeric indices
How can we select multiple columns using a vector of their numeric indices (position) in data.table ?
5 Answers
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What is the difference between setUp() and setUpClass() in Python unittest?
...fore and after each test method.
For example:
class Example(unittest.TestCase):
@classmethod
def setUpClass(cls):
print("setUpClass")
def setUp(self):
print("setUp")
def test1(self):
print("test1")
def test2(self):
print("test2")
def tear...
Running multiple TeamCity Agents on the same computer?
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Yes, it's possible:
Several agents can be installed on a single machine. They function as separate agents and TeamCity works with them as different agents, not utilizing the fact that they share the same machine.
After installing one agent you can install addi...
PHP: How to handle
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You're probably not accessing it correctly. You can output it directly or cast it as a string. (in this example, the casting is superfluous, as echo automatically does it anyway)
$content = simplexml_load_string(
'<content><![CDATA[Hello, world!]]></con...
Why use 'git rm' to remove a file instead of 'rm'?
...t up with git add <fileRemoved>. git rm does this in one step.
You can also use git rm --cached which will remove the file from the index (staging it for deletion on the next commit), but keep your copy in the local file system.
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Best way to store date/time in mongodb
...ve type supports a whole range of useful methods out of the box, which you can use in your map-reduce jobs, for example.
If you need to, you can easily convert Date objects to and from Unix timestamps1), using the getTime() method and Date(milliseconds) constructor, respectively.
1) Strictly speak...
What is the 'dynamic' type in C# 4.0 used for?
C# 4.0 introduced a new type called 'dynamic'. It all sounds good, but what would a programmer use it for?
10 Answers
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How do I write unencoded Json to my View using Razor?
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What can i do if i want some encoded text in my objects properties? \,{\"UrlPart\":\"TjcolklFX5c\",\"Title\":\"When Mama Isn\u0027t Home\"},{\" For example. This will break beacause js thinks the ' is escaping the native stri...
Rails where condition using NOT NIL
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The canonical way to do this with Rails 3:
Foo.includes(:bar).where("bars.id IS NOT NULL")
ActiveRecord 4.0 and above adds where.not so you can do this:
Foo.includes(:bar).where.not('bars.id' => nil)
Foo.includes(:bar).whe...
Setting href attribute at runtime
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To get or set an attribute of an HTML element, you can use the element.attr() function in jQuery.
To get the href attribute, use the following code:
var a_href = $('selector').attr('href');
To set the href attribute, use the following code:
$('selector').attr('href','htt...