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`levels
...The code is simply setting up a sort of pipeline:
Start with dat$product
Convert it to a factor
Change the levels
Store that in res
Personally, I think that line of code is beautiful ;)
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C# 5 async CTP: why is internal “state” set to 0 in generated code before EndAwait call?
... was giving a talk about the new C# "async" feature, in particular delving into what the generated code looked like, and the GetAwaiter() / BeginAwait() / EndAwait() calls.
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How do I Sort a Multidimensional Array in PHP [duplicate]
...ompared in a "dumb" manner (e.g. date strings) you can also specify how to convert these items to a value that can be directly compared (e.g. a DateTime instance).
It's associative if you want: this code takes care of sorting items, but you select the actual sort function (usort or uasort).
Finally,...
What are copy elision and return value optimization?
...
Introduction
For a technical overview - skip to this answer.
For common cases where copy elision occurs - skip to this answer.
Copy elision is an optimization implemented by most compilers to prevent extra (potentially expens...
Debugging with command-line parameters in Visual Studio
...
The Mozilla.org FAQ on debugging Mozilla on Windows is of interest here.
In short, the Visual Studio debugger can be invoked on a program from the command line, allowing one to specify the command line arguments when invoking a command line program, directly on the command line.
T...
Mock vs MagicMock
...y was MagicMock made a separate thing rather than just folding the ability into the default mock object?
A: One reasonable answer is that the way MagicMock works is that it preconfigures all these protocol methods by creating new Mocks and
setting them, so if every new mock created a bunch of...
Controlling mouse with Python
...api.mouse_event(win32con.MOUSEEVENTF_MOVE | win32con.MOUSEEVENTF_ABSOLUTE, int(x/SCREEN_WIDTH*65535.0), int(y/SCREEN_HEIGHT*65535.0)) in my experience for better integration with other application such as games.
– Falcon
May 31 '12 at 18:59
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How can one see the structure of a table in SQLite? [duplicate]
...todos_server_snapshot
sqlite> .schema alarms
CREATE TABLE alarms (ROWID INTEGER PRIMARY KEY AUTOINCREMENT, alarm_id,
todo INTEGER, flags INTEGER, offset_days INTEGER,
reminder_date INTEGER, time INTEGER, argument,
unrecognized_data BL...
ASP.NET MVC ambiguous action methods
...ased solely on signature, so this will fail:
public ActionResult MyMethod(int someInt) { /* ... */ }
public ActionResult MyMethod(string someString) { /* ... */ }
However, it does support method overloading based on attribute:
[RequireRequestValue("someInt")]
public ActionResult MyMethod(int som...
What does the exclamation mark mean in a Haskell declaration?
...ok at an example, so that we can see just what this means:
data Foo = Foo Int Int !Int !(Maybe Int)
f = Foo (2+2) (3+3) (4+4) (Just (5+5))
The function f above, when evaluated, will return a "thunk": that is, the code to execute to figure out its value. At that point, a Foo doesn't even exist ye...