大约有 45,500 项符合查询结果（耗时：0.0485秒） [XML]
How do I check if a variable exists in a list in BASH
...ho 'no'
or create a function:
contains() {
[[ $1 =~ (^|[[:space:]])$2($|[[:space:]]) ]] && exit(0) || exit(1)
}
to use it:
contains aList anItem
echo $? # 0： match, 1: failed
share
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curl POST format for CURLOPT_POSTFIELDS
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edited Mar 7 '11 at 20:40
answered Mar 7 '11 at 20:35
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Google Gson - deserialize list object? (generic type)
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edited Mar 20 '18 at 12:20
Daniel Pryden
52.7k1212 gold badges8787 silver badges128128 bronze badges
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How to split last commit into two in Git
...o that now it looks like this:
1
something
something else
something again
2
Now I decide that I want to split it into two, and I want the insertion of the
first line to be in the first commit, and the insertion of the last line to be
in the second commit.
First I go back to HEAD's parent, but I ...
How to get an object's properties in JavaScript / jQuery?
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142
You can look up an object's keys and values by either invoking JavaScript's native for in loop:
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What are the pros and cons of the SVN plugins for Eclipse, Subclipse and Subversive? [closed]
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32 Answers
32
Active
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How to extend an existing JavaScript array with another array, without creating a new array
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Arsen Khachaturyan
5,90933 gold badges3232 silver badges3434 bronze badges
answered Sep 3 '09 at 15:27
DzinXDzinX
43....
Maximum on http header values?
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325
No, HTTP does not define any limit. However most web servers do limit size of headers they acce...
How to properly match varargs in Mockito
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238
Mockito 1.8.1 introduced anyVararg() matcher:
when(a.b(anyInt(), anyInt(), Matchers.<Strin...
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...