大约有 47,000 项符合查询结果(耗时:0.0737秒) [XML]

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Should I use a data.frame or a matrix?

When should one use a data.frame , and when is it better to use a matrix ? 6 Answers ...
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jQuery .hasClass() vs .is()

is there a preferred method of determining whether an element is assigned a class, from a performance standpoint? 4 Answers...
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Merging two images in C#/.NET

Simple idea: I have two images that I want to merge, one is 500x500 that is transparent in the middle the other one is 150x150. ...
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How do I do multiple CASE WHEN conditions using SQL Server 2008?

What I'm trying to do is use more than one CASE WHEN condition for the same column. 10 Answers ...
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How to initialize a vector in C++ [duplicate]

I want to initialize a vector like we do in case of an array. 2 Answers 2 ...
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How to remove last n characters from every element in the R vector

I am very new to R, and I could not find a simple example online of how to remove the last n characters from every element of a vector (array?) ...
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How do you run a command for each line of a file?

For example, right now I'm using the following to change a couple of files whose Unix paths I wrote to a file: 9 Answers ...
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Creating a JavaScript cookie on a domain and reading it across sub domains

Below is a JavaScript cookie that is written on the user's computer for 12 months. 4 Answers ...
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UILabel text margin [duplicate]

I'm looking to set the left inset/margin of a UILabel and can't find a method to do so. The label has a background set so just changing its origin won't do the trick. It would be ideal to inset the text by 10px or so on the left hand side. ...
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In Python, how do you convert a `datetime` object to seconds?

Apologies for the simple question... I'm new to Python... I have searched around and nothing seems to be working. 10 Answer...