大约有 9,000 项符合查询结果(耗时:0.0173秒) [XML]

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rgdal package installation

The issue here is not exactly how to plot maps through R, as I have found already a pretty nice example here , but rather how to make it work. In fact, I am unable to load library rgdal : ...
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Git - Pushing code to two remotes [duplicate]

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ASP.NET Identity DbContext confusion

A default MVC 5 App comes with this piece of code in IdentityModels.cs - this piece of code is for all the ASP.NET Identity operations for the default templates: ...
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What is the difference between varchar and nvarchar?

Is it just that nvarchar supports multibyte characters? If that is the case, is there really any point, other than storage concerns, to using varchars ? ...
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Get Image size WITHOUT loading image into memory

I understand that you can get the image size using PIL in the following fashion 6 Answers ...
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Finding all objects that have a given property inside a collection [duplicate]

I have some complicated object, such as a Cat, which has many properties, such as age, favorite cat food, and so forth. 2...
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How to output numbers with leading zeros in JavaScript [duplicate]

I can round to x amount of decimal places with math.round but is there a way to round left of the decimal? for example 5 becomes 05 if I specify 2 places ...
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ld: warning: directory not found for option’

When I'm building my Xcode 4 apps I'm getting this warning: 30 Answers 30 ...
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How to list files in a directory in a C program?

I'm trying to write an ftp server on Linux. In this matter how can I list files in the directory on terminal by a C program? Maybe I can use exec function to run find command but I want file name as a string to send client program. How can I do this? ...
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Migrating from JSF 1.2 to JSF 2.0

I am working with a rather large app written in JSF 1.2 . JSF 1.2 is around 6 years old now. I need to upgrade to JSF 2.0. How painful will this be? I noticed that some attributes in custom tags have been changed etc. ...