大约有 45,000 项符合查询结果（耗时：0.0587秒） [XML]
What does the ^ operator do in Java?
...
422
The ^ operator in Java
^ in Java is the exclusive-or ("xor") operator.
Let's take 5^6 as exam...
Finding index of character in Swift String
...
32 Answers
32
Active
...
How to open multiple pull requests on GitHub
...
|
edited Oct 27 '19 at 13:17
ahmednabil88
11.8k99 gold badges3939 silver badges7878 bronze badges
...
Pass a data.frame column name to a function
...
You can just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[,column])
}
fun1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function...
What is the purpose and use of **kwargs?
...
|
edited Jul 29 '18 at 23:24
omkaartg
2,03811 gold badge66 silver badges2121 bronze badges
...
Difference between array_map, array_walk and array_filter
... preserve the keys.
Example:
<pre>
<?php
$origarray1 = array(2.4, 2.6, 3.5);
$origarray2 = array(2.4, 2.6, 3.5);
print_r(array_map('floor', $origarray1)); // $origarray1 stays the same
// changes $origarray2
array_walk($origarray2, function (&$v, $k) { $v = floor($v); });
print_...
Overloading Macro on Number of Arguments
I have two macros FOO2 and FOO3 :
8 Answers
8
...
Android Studio: how to attach Android SDK sources?
...able only for API levels 14 and above.
UPDATE ( Based on stable release 3.2.1):
Google changes the approach of shipping the sources, so lets see what changed.
Go to the following location
Preferences -> Apperance & Behaviour -> System Settings -> Android SDK
Quite lazy to navigate...
R: += (plus equals) and ++ (plus plus) equivalent from c++/c#/java, etc.?
...
|
edited Jan 26 '18 at 13:02
zx8754
38.6k1010 gold badges8787 silver badges146146 bronze badges
...
SSH to Elastic Beanstalk instance
...
I found it to be a 2-step process. This assumes that you've already set up a keypair to access EC2 instances in the relevant region.
Configure Security Group
In the AWS console, open the EC2 tab.
Select the relevant region and click on Secur...