大约有 47,000 项符合查询结果(耗时:0.0737秒) [XML]
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
...
jQuery .hasClass() vs .is()
is there a preferred method of determining whether an element is assigned a class, from a performance standpoint?
4 Answers...
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.
...
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
...
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
...
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?)
...
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
...
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
...
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.
...
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...
