大约有 44,400 项符合查询结果（耗时：0.0348秒） [XML]
redirect COPY of stdout to log file from within bash script itself
...
297
#!/usr/bin/env bash
# Redirect stdout ( > ) into a named pipe ( >() ) running "tee"
exe...
How to debug Apache mod_rewrite
...
284
One trick is to turn on the rewrite log. To turn it on,try these lines in your apache main con...
XDocument.ToString() drops XML Encoding Tag
...
|
edited May 23 '17 at 12:10
Community♦
111 silver badge
answered Aug 4 '09 at 17:56
...
Capitalize first letter. MySQL
...
279
It's almost the same, you just have to change to use the CONCAT() function instead of the + op...
Best way of returning a random boolean value
...
245
A declarative snippet using Array#sample:
random_boolean = [true, false].sample
...
Defining an array of anonymous objects in CoffeeScript
...
28
you can't:
this is some tricks:
items:[
(name:"value1")
(name:"value2")
]
another
...
How to use sed to remove the last n lines of a file
...
22 Answers
22
Active
...
What are the pros and cons of the SVN plugins for Eclipse, Subclipse and Subversive? [closed]
...
32 Answers
32
Active
...
How to extend an existing JavaScript array with another array, without creating a new array
...
Arsen Khachaturyan
5,90933 gold badges3232 silver badges3434 bronze badges
answered Sep 3 '09 at 15:27
DzinXDzinX
43....
Remove duplicated rows using dplyr
...tion for this purpose.
Original answer below:
library(dplyr)
set.seed(123)
df <- data.frame(
x = sample(0:1, 10, replace = T),
y = sample(0:1, 10, replace = T),
z = 1:10
)
One approach would be to group, and then only keep the first row:
df %>% group_by(x, y) %>% filter(row_num...