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What is the meaning of id?
...ny type, but unlike void * it always points to an Objective-C object. For example, you can add anything of type id to an NSArray, but those objects must respond to retain and release.
The compiler is totally happy for you to implicitly cast any object to id, and for you to cast id to any object. Th...
Python: Making a beep noise
...
interesting, it doesn't exists in my anaconda environment...is that weird?
– Charlie Parker
Jun 22 '16 at 20:16
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Circle line-segment collision detection algorithm?
...tion is found by..
Plugging:
P = E + t * d
This is a parametric equation:
Px = Ex + tdx
Py = Ey + tdy
into
(x - h)2 + (y - k)2 = r2
(h,k) = center of circle.
Note: We've simplified the problem to 2D here, the solution we get applies also in 3D
to get:
Expand
x2 - 2xh + h2 + y2 - 2yk + k2 -...
Replace a value in a data frame based on a conditional (`if`) statement
... what if you have multiple columns?
– geodex
Apr 19 '15 at 21:33
add a comment
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How can I dynamically set the position of view in Android?
How can I change the position of view through code? Like changing its X, Y position. Is it possible?
12 Answers
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pinterest api documentation [closed]
...y to guess). All of the above endpoints require an access_token parameter except for the login endpoint.
To generate a valid access_token, the developer will need to be granted access to the API by Pinterest which we all know is currently almost impossible.
Another option is to write a script to s...
What is compiler, linker, loader?
... +=================+
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| Lexical Analyzer|
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+-----------------+
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| Syntax Analyzer |
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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
... Java, did not get generics. This means that, at run time, only the class exists, not its type parameters. In the example, JVM knows it is handling a scala.collection.immutable.List, but not that this list is parameterized with Int.
Fortunately, there's a feature in Scala that lets you get around th...
Entity Framework DateTime and UTC
... var properties = entity.GetType().GetProperties()
.Where(x => x.PropertyType == typeof(DateTime) || x.PropertyType == typeof(DateTime?));
foreach (var property in properties)
{
var attr = property.GetCustomAttribute<DateTimeKindAttribute>();
...
How to use glob() to find files recursively?
... with a dot (.); like files in the current directory or hidden files on Unix based system, use the os.walk solution below.
os.walk
For older Python versions, use os.walk to recursively walk a directory and fnmatch.filter to match against a simple expression:
import fnmatch
import os
matches = []
fo...