大约有 42,000 项符合查询结果（耗时：0.0381秒） [XML]
Relative frequencies / proportions with dplyr
...()) %>%
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 makes it ea...
Where does Jenkins store configuration files for the jobs it runs?
...
130
Jenkins stores the configuration for each job within an eponymous directory in jobs/. The job c...
How to match “any character” in regular expression?
...
answered May 26 '10 at 12:31
Delan AzabaniDelan Azabani
70.4k2222 gold badges154154 silver badges189189 bronze badges
...
How do I specify the Linq OrderBy argument dynamically?
...
3
But is it true when it comes to Linq expressions interpreted by providers, like Entity Framework (sql server, or other ) ??
...
What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
...
337
Running a command through /usr/bin/env has the benefit of looking for whatever the default ver...
Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib
...
379
I was getting the exact same error, but the above answers didn't work for me. I had to reinsta...
How to import module when module name has a '-' dash or hyphen in it?
... |
edited Dec 2 '11 at 13:56
answered Dec 2 '11 at 2:00
S...
?: operator (the 'Elvis operator') in PHP
...
543
It evaluates to the left operand if the left operand is truthy, and the right operand otherwise....
Overriding id on create in ActiveRecord
...
13 Answers
13
Active
...
Why are data transfer objects (DTOs) an anti-pattern?
... |
edited Jan 25 '10 at 3:40
Jim Ferrans
28.4k1212 gold badges5151 silver badges8282 bronze badges
ans...