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getting the screen density programmatically in android?
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Extracting numbers from vectors of strings
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Declaring variables inside or outside of a loop
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edited Aug 6 '17 at 13:35
answered Jan 10 '12 at 13:12
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The remote end hung up unexpectedly while git cloning
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搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...命令可以登录主节点使用
db.adminCommand({replSetStepDown : 1})
如果杀不掉可以使用强制开关
db.adminCommand({replSetStepDown : 1, force : true})
或者使用 rs.stepDown(120)也可以达到同样的效果，中间的数字指不能在停止服务这段时间成...
How to perform element-wise multiplication of two lists?
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bash/fish command to print absolute path to a file
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Use realpath
$ realpath example.txt
/home/username/example.txt
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Why can't I use a list as a dict key in python?
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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...