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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ns often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex ...
How to compare arrays in C#? [duplicate]
...urn false;
var comparer = EqualityComparer<T>.Default;
for (int i = 0; i < a1.Length; i++)
{
if (!comparer.Equals(a1[i], a2[i])) return false;
}
return true;
}
.NET 3.5 or higher solution
Or use SequenceEqual if Linq is available for you (.NET Framework >=...
How to format strings in Java
...you've provided and you can use it for parsing as well.
For example:
int someNumber = 42;
String someString = "foobar";
Object[] args = {new Long(someNumber), someString};
MessageFormat fmt = new MessageFormat("String is \"{1}\", number is {0}.");
System.out.println(fmt.format(args));
A nice...
How to break lines at a specific character in Notepad++?
...
If the text contains \r\n that need to be converted into new lines use the 'Extended' or 'Regular expression' modes and escape the backslash character in 'Find what':
Find what: \\r\\n
Replace with: \r\n
...
Best way to implement keyboard shortcuts in a Windows Forms application?
... for it to be exclusively called by an event) or refactor the common logic into a separate method.
– Hans Passant
Jun 10 '14 at 11:26
15
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Warning message: In `…` : invalid factor level, NA generated
...
@David Why does R convert it into Factor?
– KannarKK
Aug 2 '15 at 10:00
...
How can I do a case insensitive string comparison?
...
@ErikE: You don't understand my point of view. Old answers corresponds the time of writing. One should not touch old answers. It's true about the most products. The best practice or the best choice from performance point of view can be changed multiple times ...
How can we print line numbers to the log in java
How to print line numbers to the log. Say when outputting some information to the log, I also want to print the line number where that output is in the source code. As we can see in the stack trace, it displays the line number where the exception has occurred. Stack trace is available on the excepti...
How to detect incoming calls, in an Android device?
...ation-->
<receiver android:name=".CallReceiver" >
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGO...
initialize a numpy array
... way I usually do that is by creating a regular list, then append my stuff into it, and finally transform the list to a numpy array as follows :
import numpy as np
big_array = [] # empty regular list
for i in range(5):
arr = i*np.ones((2,4)) # for instance
big_array.append(arr)
big_np_arra...