大约有 39,000 项符合查询结果（耗时：0.0286秒） [XML]
How to change Navigation Bar color in iOS 7?
How do I change the Navigation Bar color in iOS 7?
18 Answers
18
...
Boolean.hashCode()
...
1231 and 1237 are just two (sufficiently large) arbitrary prime numbers. Any other two large prime numbers would do fine.
Why primes?
Suppose for a second that we picked composite numbers (non-primes), say 1000 and 2000. When inserting ...
Setting a system environment variable from a Windows batch file?
... environment variable at the system level from a command prompt in Windows 7 (or even XP for that matter). I am running from an elevated command prompt.
...
Do Swift-based applications work on OS X 10.9/iOS 7 and lower?
Will Swift-based applications work on OS X 10.9 (Mavericks)/iOS 7 and lower?
19 Answers
...
Can dplyr package be used for conditional mutating?
...
Use ifelse
df %>%
mutate(g = ifelse(a == 2 | a == 5 | a == 7 | (a == 1 & b == 4), 2,
ifelse(a == 0 | a == 1 | a == 4 | a == 3 | c == 4, 3, NA)))
Added - if_else: Note that in dplyr 0.5 there is an if_else function defined so an alternative would be to replace ife...
warning: [options] bootstrap class path not set in conjunction with -source 1.5
... |
edited Apr 26 '17 at 18:01
Dave Jarvis
27.6k3535 gold badges157157 silver badges281281 bronze badges
...
Cartesian product of x and y array points into single array of 2D points
... |
edited May 23 '17 at 11:55
Community♦
111 silver badge
answered Jun 21 '12 at 18:43
...
Why does 'continue' behave like 'break' in a Foreach-Object?
... simulates the continue in a loop.
1..100 | ForEach-Object {
if ($_ % 7 -ne 0 ) { return }
Write-Host "$($_) is a multiple of 7"
}
There is a gotcha to be kept in mind when refactoring. Sometimes one wants to convert a foreach statement block into a pipeline with a ForEach-Object cmdlet (...
'str' object does not support item assignment in Python
...
7 Answers
7
Active
...
How can I do division with variables in a Linux shell?
...
|
edited Aug 7 '13 at 3:04
answered Aug 7 '13 at 2:59
...