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How do you delete a column by name in data.table?
...column foo from the data.table df3:
# Method 1 (and preferred as it takes 0.00s even on a 20GB data.table)
df3[,foo:=NULL]
df3[, c("foo","bar"):=NULL] # remove two columns
myVar = "foo"
df3[, (myVar):=NULL] # lookup myVar contents
# Method 2a -- A safe idiom for excluding (possibly multiple)
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How to trigger XDebug profiler for a command line PHP script?
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answered Feb 18 '10 at 13:12
joujou
5,55633 gold badges1919 silver badges2424 bronze badges
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Making button go full-width?
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Beau Smith
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answered Nov 4 '13 at 21:43
LaykeLayke
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How to know if two arrays have the same values
...1.concat().sort();
var arr2 = _arr2.concat().sort();
for (var i = 0; i < arr1.length; i++) {
if (arr1[i] !== arr2[i])
return false;
}
return true;
}
Note that this doesn't modify original arrays unlike a previous answer.
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Remove all spaces from a string in SQL Server
What is the best way to remove all spaces from a string in SQL Server 2008?
23 Answers
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Error: “Cannot modify the return value” c#
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204
This is because Point is a value type (struct).
Because of this, when you access the Origin pr...
Where does System.Diagnostics.Debug.Write output appear?
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edited Jul 21 '09 at 15:26
answered Jul 21 '09 at 15:10
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Save the console.log in Chrome to a file
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edited Jul 7 '15 at 19:30
Jeff Yates
57.4k1818 gold badges133133 silver badges180180 bronze badges
ans...
Is there any difference between a GUID and a UUID?
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The simple answer is: **no difference, they are the same thing.
2020-08-20 Update: While GUIDs (as used by Microsoft) and UUIDs (as defined by RFC4122) look similar and serve similar purposes, there are subtle-but-occasionally-important differences. Specifically, some Microsoft GUID docs ...
C# - How to get Program Files (x86) on Windows 64 bit
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230
The function below will return the x86 Program Files directory in all of these three Windows con...