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How to calculate the number of occurrence of a given character in each row of a column of strings?
...o that internally.
Here's benchmark results (with a scaled up size of the test to 3000 rows)
q.data<-q.data[rep(1:NROW(q.data), 1000),]
str(q.data)
'data.frame': 3000 obs. of 3 variables:
$ number : int 1 2 3 1 2 3 1 2 3 1 ...
$ string : Factor w/ 3 levels "greatgreat","magic",....
Is there a difference between “==” and “is”?
...;>> b is a
False
>>> b == a
True
In your case, the second test only works because Python caches small integer objects, which is an implementation detail. For larger integers, this does not work:
>>> 1000 is 10**3
False
>>> 1000 == 10**3
True
The same holds true ...
How to start a Process as administrator mode in C# [duplicate]
...(string[] args) {
try {
File.WriteAllText(@"c:\program files\test.txt", "hello world");
}
catch (Exception ex) {
Console.WriteLine(ex.ToString());
Console.ReadLine();
}
}
}
}
First verified that I get the UAC bomb:
System.UnauthorizedAccess...
Get path of executable
...as added to Boost in version 1.61.0.
The following is my solution. I have tested it on Windows, Mac OS X, Solaris, Free BSD, and GNU/Linux.
It requires Boost 1.55.0 or greater. It uses the Boost.Filesystem library directly and the Boost.Locale library and Boost.System library indirectly.
src/exec...
Quickly create large file on a Windows system
... file createnew does NOT create sparse files: c:\>fsutil file createnew test.txt 0x100000 File c:\test.txt is created c:\>fsutil sparse queryflag test.txt This file is NOT set as sparse
– ivan_pozdeev
Oct 20 '17 at 6:29
...
Signing a Windows EXE file
...DK 7.0.)
If you'd like to get a hold of certificate that you can use to test your process of signing the executable you can use the .NET tool Makecert.
Certificate Creation Tool (Makecert.exe)
Once you've created your own certificate and have used it to sign your executable, you'll need to manu...
What's wrong with using == to compare floats in Java?
...
the correct way to test floats for 'equality' is:
if(Math.abs(sectionID - currentSectionID) < epsilon)
where epsilon is a very small number like 0.00000001, depending on the desired precision.
...
How do I correctly detect orientation change using Phonegap on iOS?
I found this orientation test code below looking for JQTouch reference material. This works correctly in the iOS simulator on mobile Safari but doesn’t get handled correctly in Phonegap. My project is running into the same issue that is killing this test page. Is there a way to sense the orientati...
Algorithm to compare two images
...ns you should identify and compromise on.
Matlab is an excellent tool for testing and evaluating images.
Testing the algorithms
You should test (at the minimum) a large human analysed set of test data where matches are known beforehand. If for example in your test data you have 1,000 images wher...
How can you encode a string to Base64 in JavaScript?
...la.javascript.EcmaError: TypeError: Cannot find function replace in object teste teste teste I'm trying to encode .txt with "teste teste teste". Anyone knows why this error?
– PRVS
Nov 4 '15 at 9:19
...