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Difference between var_dump,var_export & print_r
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var_dump is for debugging purposes. var_dump always prints the result.
// var_dump(array('', fa...
ASP.NET web.config: configSource vs. file attributes
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file attribute
Specifies a relative path to an external file that contains custom application ...
how to File.listFiles in alphabetical order?
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4 Answers
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How to pass the -D System properties while testing on Eclipse?
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Run -> Run configurations, select project, second tab: “Arguments”. Top box is for your p...
How to truncate string using SQL server
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edited Aug 2 '18 at 9:04
marsze
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answered Feb ...
How can I insert values into a table, using a subquery with more than one result?
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Mike RyanMike Ryan
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How to run Maven from another directory (without cd to project dir)?
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NSDictionary - Need to check whether dictionary contains key-value pair or not
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Just ask it for the objectForKey:@"b". If it returns nil, no object is set at that key.
if ([x...
Vim: How do you open another [No Name] buffer like the one on startup?
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There are many ways to open a new buffer with no name, the simplest of which is :new.
:new will...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... return x*2, x*3
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In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], df["A2"] = zip(*df["a"].map(calculate))
In [6]: df
Out[6]:
a b A1 A2
0 1 2 2 3
1 2 3 4 6
2 3 4 6 9
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