大约有 44,500 项符合查询结果（耗时：0.0429秒） [XML]
Properties vs Methods
...
152
From the Choosing Between Properties and Methods section of Design Guidelines for Developing Cla...
Repeat each row of data.frame the number of times specified in a column
...
Here's one solution:
df.expanded <- df[rep(row.names(df), df$freq), 1:2]
Result:
var1 var2
1 a d
2 b e
2.1 b e
3 c f
3.1 c f
3.2 c f
share
|
im...
How to view UTF-8 Characters in VIM or Gvim
...
62
Try to reload the document using:
:e! ++enc=utf8
If that works you should maybe change the f...
Working with huge files in VIM
I tried opening a huge (~2GB) file in VIM but it choked. I don't actually need to edit the file, just jump around efficiently.
...
Convert a String In C++ To Upper Case
...
29 Answers
29
Active
...
Function Pointers in Java
...
126
The Java idiom for function-pointer-like functionality is an an anonymous class implementing an...
Getting and removing the first character of a string
I would like to do some 2-dimensional walks using strings of characters by assigning different values to each character. I was planning to 'pop' the first character of a string, use it, and repeat for the rest of the string.
...
Gson: Directly convert String to JsonObject (no POJO)
... |
edited Nov 19 '15 at 12:56
pixel
19.6k2828 gold badges106106 silver badges175175 bronze badges
answe...
How to pass optional arguments to a method in C++?
...
|
edited May 25 '18 at 10:44
AustinWBryan
2,86133 gold badges1616 silver badges3535 bronze badges
...