大约有 43,170 项符合查询结果（耗时：0.0377秒） [XML]
Debian/Linux下安装OpenJDK8 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
Debian/Linux下安装OpenJDK8linux_install_openjdk8因为Debian11的源里不再带OpenJDK8了，需要手工来安装。下载安装包因为手工安装，所以部分依赖包需要自己下载。wget http: snapshot debian org archive debian-security 202202 因为Debian11的源里不再带Open...
Extracting numbers from vectors of strings
...
11 Answers
11
Active
...
CSS3 Transparency + Gradient
...
|
edited Jun 16 '12 at 16:08
umassthrower
96911 gold badge88 silver badges1515 bronze badges
...
Relative frequencies / proportions with dplyr
...se(n = n()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That mak...
jQuery attr vs prop?
...
71
Unfortunately none of your links work :(
Some insight though, attr is for all attributes. prop i...
How to perform element-wise multiplication of two lists?
...
14 Answers
14
Active
...
Minimum and maximum date
...
179
From the spec, §15.9.1.1:
A Date object contains a Number indicating a particular instant in...
leading zeros in rails
...min , both integers in my application. For hr field, if the user enters "1" I would like Rails to automatically pad it to "01" before saving it to the database. Also for the min field if the user enter "0" it should put in as "00".
...
What is the best way to auto-generate INSERT statements for a SQL Server table?
...
1055
Microsoft should advertise this functionality of SSMS 2008. The feature you are looking for i...
Cleaning `Inf` values from an R dataframe
...
121
Option 1
Use the fact that a data.frame is a list of columns, then use do.call to recreate a ...