大约有 39,480 项符合查询结果（耗时：0.0522秒） [XML]
Is it possible to cast a Stream in Java 8?
... |
edited May 23 '17 at 12:26
Community♦
111 silver badge
answered Jun 12 '14 at 18:43
...
How to write an XPath query to match two attributes?
...66231 44.6595 4.66231C43.6264 4.66231 43.1481 5.28821 43.1481 6.59048V11.9512C43.1481 13.2535 43.6264 13.8962 44.6595 13.8962C45.6924 13.8962 46.1709 13.2535 46.1709 11.9512V9.17788Z\"/\u003e\u003cpath d=\"M32.492 10.1419C32.492 12.6954 34.1182 14.0484 37.0451 14.0484C39.9723 14.0484 41.5985 12.6954...
How to use GNU Make on Windows?
...
answered Oct 14 '12 at 19:26
user1594322user1594322
1,81633 gold badges1616 silver badges1515 bronze badges
...
WPF Command Line
...OnStartup.
– MuiBienCarlota
Jun 11 '12 at 15:19
add a comment
|
...
View's SELECT contains a subquery in the FROM clause
...
NonymNonym
5,82911 gold badge2121 silver badges2121 bronze badges
17
...
How do I undo “Scope to this” in Visual Studio 2012?
...start VS
– Piotr Kula
May 11 '17 at 12:21
...
Remove duplicated rows using dplyr
...ction 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_nu...
How to create NSIndexPath for TableView
...
JohnVanDijkJohnVanDijk
3,41611 gold badge2121 silver badges2525 bronze badges
add a comment
...
How to copy in bash all directory and files recursive?
...66231 44.6595 4.66231C43.6264 4.66231 43.1481 5.28821 43.1481 6.59048V11.9512C43.1481 13.2535 43.6264 13.8962 44.6595 13.8962C45.6924 13.8962 46.1709 13.2535 46.1709 11.9512V9.17788Z\"/\u003e\u003cpath d=\"M32.492 10.1419C32.492 12.6954 34.1182 14.0484 37.0451 14.0484C39.9723 14.0484 41.5985 12.6954...
switch() statement usage
...
120
Well, timing to the rescue again. It seems switch is generally faster than if statements.
So t...