大约有 11,419 项符合查询结果（耗时：0.0236秒） [XML]
Convert a list of data frames into one data frame
....3.0 (2016-05-03)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
> packageVersion("plyr")
[1] ‘1.8.4’
> packageVersion("dplyr")
[1] ‘0.5.0’
> packageVersion("data.table")
[1] ‘1.9.6’
UPDATE:
Rerun 31-Jan-2018. Ran on the ...
How to select .NET 4.5.2 as a target framework in Visual Studio
I have installed .NET Framework 4.5.2 on Windows 8.1. But in Visual Studio 2013 I do not see the .NET Framework 4.5.2 option (see screenshot). How do I target my project for .NET 4.5.2?
...
How to “comment-out” (add comment) in a batch/cmd?
... @Alhadis, Perl's Configure script is written in Bourne shell, not Windows batch, so how is it relevant here? Furthermore, the colon command being valid Bourne syntax is not a "bonus side effect"; it's precisely why it's used in that Bourne script. It's used in favor of # for comments becaus...
C#: Printing all properties of an object [duplicate]
...exists... especially since you can do it in Visual Studio in the Immediate Window. There you can an object name (while in debug mode), press enter, and it is printed fairly prettily with all its stuff.
...
ASP.NET MVC Custom Error Handling Application_Error Global.asax?
...()
{
Script = "try{history.pushState(null,null,window.location.href);}catch(err){}window.location.replace('" + UrlHelper.GenerateContentUrl(this.Url, context.HttpContext) + "');"
};
result.ExecuteResult(context);
}
else
{
...
Can't connect to localhost on SQL Server Express 2012 / 2016
...s 2012 but I cannot connect to localhost. I tried localhost\SQLExpress and Windows authentication but it gives me an error message saying cannot connect. Am I missing something here? I've used SQL Server 2008 before and I've never had issues connecting to localhost. It seems that it can't even find ...
How to convert IPython notebooks to PDF and HTML?
...onvert the html file notebook.html into a pdf file called notebook.pdf. In Windows, Mac or Linux, install wkhtmltopdf. wkhtmltopdf is a command line utility to convert html to pdf using WebKit. You can download wkhtmltopdf from the linked webpage, or in many Linux distros it can be found in their re...
Dealing with commas in a CSV file
...
You may also need to translate \r\n for windows compliance, depending on your application.
– Mandrake
Feb 29 '12 at 17:51
3
...
Java system properties and environment variables
...ables are set in the OS, e.g. in Linux export HOME=/Users/myusername or on Windows SET WINDIR=C:\Windows etc,
and, unlike properties, may not be set at runtime.
To get a specific environment variable you can use System.getenv(String name).
...
Pure JavaScript Send POST Data Without a Form
... res);
});
If you are as lazy as me (or just prefer a shortcut/helper):
window.post = function(url, data) {
return fetch(url, {method: "POST", body: JSON.stringify(data)});
}
// ...
post("post/data/here", {element: "osmium"});
...