大约有 40,000 项符合查询结果(耗时:0.0344秒) [XML]

https://stackoverflow.com/ques... 

Convert unix time to readable date in pandas dataframe

...12.15 3 1349979305 12.19 4 1350065705 12.15 In [25]: df['date'] = pd.to_datetime(df['date'],unit='s') In [26]: df.head() Out[26]: date price 0 2012-10-08 18:15:05 12.08 1 2012-10-09 18:15:05 12.35 2 2012-10-10 18:15:05 12.15 3 2012-10-11 18:15:05 12.19 4 2012-10-12 18:15:...
https://stackoverflow.com/ques... 

Why would finding a type's initializer throw a NullReferenceException?

....cs: (196c.1874): Access violation - code c0000005 (first chance) mscorlib_ni!System.RuntimeType.GetConstructorImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Reflection.CallingConventions, System.Type[], System.Reflection.ParameterModifier[])+0xa3: 000007fe`e5735403 488b4608 ...
https://stackoverflow.com/ques... 

WAMP shows error 'MSVCR100.dll' is missing when install

When I tried to install WAMP , that popped up the following alert, 23 Answers 23 ...
https://stackoverflow.com/ques... 

How can I give eclipse more memory than 512M?

I have following setup, but when I put 1024 and replace all 512 with 1024, then eclipse won't start at all. How can I have more than 512M memory for my eclipse JVM? ...
https://stackoverflow.com/ques... 

iPhone viewWillAppear not firing

... my navigation controller's delegate and still the method was not getting called. Anyway, I set it and then I used the methods you mention above. Thanks. – Dimitris Mar 29 '10 at 12:53 ...
https://stackoverflow.com/ques... 

Which is the correct C# infinite loop, for (;;) or while (true)? [closed]

...ve used and what I've seen others use for a loop that has to be broken manually. share | improve this answer | follow | ...
https://stackoverflow.com/ques... 

OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection

...e I was unable to find a relevant implementation I decided to accept the challenge. I made some modifications to the squares demo present in OpenCV and the resulting C++ code below is able to detect a sheet of paper in the image: void find_squares(Mat& image, vector<vector<Point> >...
https://stackoverflow.com/ques... 

Thread Safety in Python's dictionary

...mic operations, there are corner cases where they aren’t atomic (e.g. if __hash__ or __eq__ are implemented as Python methods) and their atomicity should not be relied upon. Neither should you rely on atomic variable assignment (since this in turn depends on dictionaries). Use the Queue module's Q...
https://stackoverflow.com/ques... 

How do you test running time of VBA code?

...Counter. Google it for more info. Try pushing the following into a class, call it CTimer say, then you can make an instance somewhere global and just call .StartCounter and .TimeElapsed Option Explicit Private Type LARGE_INTEGER lowpart As Long highpart As Long End Type Private Declare Fu...
https://stackoverflow.com/ques... 

Separating class code into a header and cpp file

... So this means that all files that include your header file will "see" the private members. If for example you want to publish a lib and its header, you have to show the private members of the class? – Gauthier ...