大约有 40,000 项符合查询结果（耗时：0.0294秒） [XML]
Does the ternary operator exist in R?
... Richie CottonRichie Cotton
103k3737 gold badges217217 silver badges338338 bronze badges
add a comment
...
SQL Logic Operator Precedence: And and Or
...5.7307 4.9328 45.2525 4.66231 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...
String Concatenation using '+' operator
...
Jon SkeetJon Skeet
1211k772772 gold badges85588558 silver badges88218821 bronze badges
...
Efficiently test if a port is open on Linux?
...
answered Mar 7 '12 at 21:20
Spencer RathbunSpencer Rathbun
12.9k55 gold badges4343 silver badges7171 bronze badges
...
What is this date format? 2011-08-12T20:17:46.384Z
...
Jon SkeetJon Skeet
1210k772772 gold badges85588558 silver badges88218821 bronze badges
...
Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...ith the daply function, as shown here: https://stackoverflow.com/a/7020101/210673
library(plyr)
daply(tmp, .(x, y), function(x) x$z)
## y
## x a b c
## x 1 2 3
## y 3 3 2
Using matrix indexing:
This is kinda old school but is a nice demonstration of matrix indexing, which can be really ...
Python strptime() and timezones?
...n Machin
72.5k1010 gold badges116116 silver badges172172 bronze badges
15
...
Format LocalDateTime with Timezone in Java8
...
213
LocalDateTime is a date-time without a time-zone. You specified the time zone offset format sy...
When is null or undefined used in JavaScript? [duplicate]
...
answered Jun 21 '11 at 17:29
kennebeckennebec
89.8k2828 gold badges9696 silver badges123123 bronze badges
...
How to generate a random string in Ruby
...
210
34 characters and blazing fast: ('a'..'z').to_a.shuffle[0,8].join. Note you'll need Ruby >=1.9 to shuffle.
– fny
...