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What's the difference between a proc and a lambda in Ruby?
...e:
p = Proc.new {|a, b| puts a**2+b**2 } # => #<Proc:0x3c7d28@(irb):1>
p.call 1, 2 # => 5
p.call 1 # => NoMethodError: undefined method `**' for nil:NilClass
p.call 1, 2, 3 # => 5
l = lambda {|a, b| puts a**2+b**2 } # => #<Proc:0x15016c@(irb):5 (lambda)>
l.call 1, 2 # =&g...
Eclipse RCP Plug-in开发自学教程（Eclipse3.6） - 文档下载 - 清泛网 - ...
...受益，也希望大家能有版本意识，转载时注明来自salever@126.com。
之前有一套基于Eclipse3.3版本的教程，也是本人整理，由于本人的疏忽，导致网络上的版本各不相同，但分享已久，无法改变，希望大家谅解并使用新版本的教程...
What is the difference between BIT and TINYINT in MySQL?
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124
A TINYINT is an 8-bit integer value, a BIT field can store between 1 bit, BIT(1), and 64 bits,...
Add a common Legend for combined ggplots
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108
Update 2015-Feb
See Steven's answer below
df1 <- read.table(text="group x y
gr...
Programmatically creating Markdown tables in R with KnitR
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122
Now knitr (since version 1.3) package include the kable function for a creation tables:
> ...
Renaming columns in pandas
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1974
Just assign it to the .columns attribute:
>>> df = pd.DataFrame({'$a':[1,2], '$b': [...
Convert a list of data frames into one data frame
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148
Use bind_rows() from the dplyr package:
bind_rows(list_of_dataframes, .id = "column_label")
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Understanding “randomness”
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1481
Just a clarification
Although the previous answers are right whenever you try to spot the ra...
How to delete history of last 10 commands in shell?
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18 Answers
18
Active
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Selecting pandas column by location
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155
Two approaches that come to mind:
>>> df
A B C D
0...