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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...
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...
How to perform elem>me m>nt-wise multiplication of two lists?
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14 Answers
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Passing param>me m>ters to JavaScript files
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CSS3 Transparency + Gradient
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edited Jun 16 '12 at 16:08
umassthrower
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Find integer index of rows with NaN in pandas datafram>me m>
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11 Answers
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Cleaning `Inf` values from an R datafram>me m>
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121
Option 1
Use the fact that a data.fram>me m> is a list of columns, then use do.call to recreate a ...
Insert space before capital letters
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170
You can just add a space before every uppercase character and trim off the leading and trailin...
C# : 'is' keyword and checking for Not
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12 Answers
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Is it safe to check floating point values for equality to 0?
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115
It is safe to expect that the comparison will return true if and only if the double variable h...