大约有 40,000 项符合查询结果（耗时：0.0520秒） [XML]
data.frame rows to a list
... 411.2097 20
While the differences are not as large as in my previous test, the straight setDF method is significantly faster at all levels of the distribution of runs with max(setDF) < min(split) and the attr method is typically more than twice as fast.
A fourth method is the extreme cham...
When should you NOT use a Rules Engine? [closed]
...iness Rule Engine, it can be very difficult to debug and involve extensive tests to make sure that things that worked before also work now.
More details on this topic can be found on a post I've written: http://dwhbp.com/post/2011/10/30/Implementing-a-Business-Rule-Engine.aspx
Overall, the bigges...
Check if a string contains one of 10 characters
...ters, and only one, then it gets a bit more complicated. I believe the fastest way would be to check against an Intersection, then check for duplicates.
private static char[] characters = new char [] { '*','&',... };
public static bool ContainsOneCharacter(string text)
{
var intersection ...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
...
Your benchmark isn't exactly testing DateTime.strptime because it's creating two new Strings every iteration which is very expensive. It's not just the string parsing like @claw said
– WattsInABox
Jan 12 '15 at 16:0...
Declare a constant array
...n at run time.
Slices and arrays are always evaluated during runtime:
var TestSlice = []float32 {.03, .02}
var TestArray = [2]float32 {.03, .02}
var TestArray2 = [...]float32 {.03, .02}
[...] tells the compiler to figure out the length of the array itself. Slices wrap arrays and are easier to work...
Where do “pure virtual function call” crashes come from?
...stance; I wasn't aware of that, but just proved it to myself with a little test code. Looking at a postmortem dump in WinDbg I thought I was dealing with a race where another thread was trying to use a derived object before it had been fully constructed, but this shines a new light on the issue, and...
How to do what head, tail, more, less, sed do in Powershell? [closed]
...
gc -TotalCount 25 C:\scripts\logs\robocopy_report.txt
The above script, tested in PS 5.1 is the SAME response as below...
gc -head 25 C:\scripts\logs\robocopy_report.txt
So then just use '-head 25" already!
share
...
What is the best way to remove accents (normalize) in a Python unicode string?
...
@Jabba: , 'utf8' is a "safety net" needed if you are testing input in terminal (which by default does not use unicode). But usually you don't have to add it, since if you're removing accents then input_str is very likely to be utf8 already. It doesn't hurt to be safe, though.
...
How to add Active Directory user group as login in SQL Server
...ASE=yourDbName
I use this as a part of restore from production server to testing machine:
USE master
GO
ALTER DATABASE yourDbName SET OFFLINE WITH ROLLBACK IMMEDIATE
RESTORE DATABASE yourDbName FROM DISK = 'd:\DropBox\backup\myDB.bak'
ALTER DATABASE yourDbName SET ONLINE
GO
CREATE LOGIN [NT AUTHO...
A reference to the dll could not be added
...nual, though, but generally references don't change too often and a proper test suite should catch the cases where you forgot to update the commands executed in the pre-build/post-build event.
– Manfred
May 13 '17 at 23:30
...