大约有 45,000 项符合查询结果（耗时：0.0464秒） [XML]
Fastest way to find second (third…) highest/lowest value in vector or column
...
I used this method, but get the following error: Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) : index 4705 outside bounds Any idea what might the issue be? Some details: My x is a numeric vector of length 4706 with some NAs in the data. I...
In what areas might the use of F# be more appropriate than C#? [closed]
...testing and reading/understanding the code. It eradicates a whole class of errors that previous systems were prone to.
Exploratory programming Working with script files and the REPL (F# Interactive) allowed me to explore the solution space more effectively before committing to an implementation tha...
DistutilsOptionError: must supply either home or prefix/exec-prefix — not both
... days trying to figure out why my virtualenv environment was screwed, with errors like Could not install packages due to an EnvironmentError: [Errno 1] Operation not permitted: '/bin/easy_install'. Removing the setup file restored my sanity
– kip2
Jun 10 '18 at...
No connection string named 'MyEntities' could be found in the application config file
...
I got this exact error message, but my .config file - in the right project - indeed listed the correct connection-string. However, I was using transformations, and the connection-string was of course not referenced in the transformed .config-...
PHP session lost after redirect
...
Check the webserver error log too; in my case, there was an error "Failed to write session data (files). Please verify that the current setting of session.save_path is correct". The permissions were wrong on the save_path directory.
...
Suppressing “is never used” and “is never assigned to” warnings in C#
...do this:
Compile the code as normal, this will add some warnings to your error list in Visual Studio
Switch to the Output window, and the Build output, and hunt for the same warnings
Copy the 4-digit warning code from the relevant message, which should look like this:
C:\Dev\VS.NET\ConsoleAppl...
Remote origin already exists on 'git push' to a new repository
...
You are getting this error because "origin" is not available. "origin" is a convention not part of the command. "origin" is the local name of the remote repository.
For example you could also write:
git remote add myorigin git@github.com:myname...
Create zip file and ignore directory structure
...ning all paths, and since you can't use -j and -r together ( you'll get an error ), you can do this instead:
cd path/to/parent/dir/;
zip -r ../my.zip ../$(basename $PWD)
cd -;
The ../$(basename $PWD) is the magic that retains the parent directory.
So now unzip my.zip will give a folder containing a...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
... strings from entering the RDBMS and causing buffer overruns or exceptions/errors later when retrieving and parsing values from the database that are longer (more bytes) than expected.
For example, if you have a field that accepts two-character strings for country abbreviations then you have no con...
Html.ActionLink as a button or an image, not a link
... This isn't valid syntax. IE10 throws a JavaScript critical error with this line, "SCRIPT5017: Syntax error in regular expression".
– Ciaran Gallagher
Feb 13 '13 at 17:34
...