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Combine two or more columns in a dataframe into a new column with a new name
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132
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb...
Create code first, many to many, with additional fields in association table
...Order = 0)]
public int MemberID { get; set; }
[Key, Column(Order = 1)]
public int CommentID { get; set; }
public virtual Member Member { get; set; }
public virtual Comment Comment { get; set; }
public int Something { get; set; }
public string SomethingElse { get; set; }...
How to Define Callbacks in Android?
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221
In many cases, you have an interface and pass along an object that implements it. Dialogs for ex...
Specify an SSH key for git push for a given domain
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14 Answers
14
Active
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Shell script to send email [duplicate]
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146
Yes it works fine and is commonly used:
$ echo "hello world" | mail -s "a subject" someone@so...
How can I measure the actual memory usage of an application or process?
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Massif writes a dump of memory usage snapshots (e.g. massif.out.12345). These provide, (1) a timeline of memory usage, (2) for each snapshot, a record of where in your program memory was allocated. A great graphical tool for analyzing these files is massif-visualizer. But I found ms_print...
How can I get all the request headers in Django?
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140
According to the documentation request.META is a "standard Python dictionary containing all av...
Parsing XML with namespace in Python via 'ElementTree'
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edited Sep 30 '14 at 15:20
answered Feb 13 '13 at 12:18
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