大约有 40,000 项符合查询结果（耗时：0.0234秒） [XML]
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...
Convert string to title case with JavaScript
...
123
Here's my version, IMO it's easy to understand and elegant too.
var str = "foo bar baz"
...
How do I profile memory usage in Python?
...
123
This one has been answered already here: Python memory profiler
Basically you do something li...
sed: print only matching group
...it with a 2nd grep.
# To extract \1 from /xx([0-9]+)yy/
$ echo "aa678bb xx123yy xx4yy aa42 aa9bb" | grep -Eo 'xx[0-9]+yy' | grep -Eo '[0-9]+'
123
4
# To extract \1 from /a([0-9]+)b/
$ echo "aa678bb xx123yy xx4yy aa42 aa9bb" | grep -Eo 'a[0-9]+b' | grep -Eo '[0-9]+'
678
9
...
Can an Option in a Select tag carry multiple values?
...
one option is to put multi value with comma seperated
like
value ="123,1234"
and in the server side separate them
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SQL query for finding records where count > 1
...p int(11) not null,
dt date not null
);
insert into payment values
(1,123,55555,'2009-12-12'),
(1,123,66666,'2009-12-12'),
(1,123,77777,'2009-12-13'),
(2,456,77777,'2009-12-14'),
(2,456,77777,'2009-12-14'),
(2,789,77777,'2009-12-14'),
(2,789,77777,'2009-12-14');
select foo.user_id, foo.cnt fro...
How to use cURL to get jSON data and decode the data?
...wer your question :P
$url="https://.../api.php?action=getThreads&hash=123fajwersa&node_id=4&order_by=post_date&order=desc&limit=1&grab_content&content_limit=1";
Using cURL
// Initiate curl
$ch = curl_init();
// Will return the response, if false it print the re...
How can one display images side by side in a GitHub README.md?
...
123
You can place each image side-by-side by writing the markdown for each image on the same line....
Putty: Getting Server refused our key Error
...tNumber = 22,
HostName = "192.168.1.188",
UserName = "user123",
//Password = "Password1",
SshHostKeyFingerprint = @"ssh-rsa 2048 qu0f........................ddowUUXA="
};
ops.SshPrivateKeyPath = @"C:\temp\rsa-key-20190505.ppk";
using (Session session = ...
What data type to use for money in Java? [closed]
...yAmount = amountFactory.setCurrency(Monetary.getCurrency("EUR")).setNumber(12345.67).create();
MonetaryAmountFormat format = MonetaryFormats.getAmountFormat(Locale.getDefault());
System.out.println(format.format(monetaryAmount));
When using the reference implementation API, the necessary code is m...