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Is there a way to 'uniq' by column?
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sort -u -t, -k1,1 file
-u for unique
-t, so comma is the delimiter
-k1,1 for the key field 1
Test result:
overflow@domain2.com,2009-11-27 00:58:29.793000000,xx3.net,255.255.255.0
stack2@domain.com,2009-11-27 01:05:47.893000000,xx2.n...
How do I compute derivative using Numpy?
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143
You have four options
Finite Differences
Automatic Derivatives
Symbolic Differentiation
Com...
The type or namespace name does not exist in the namespace 'System.Web.Mvc'
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edited Oct 23 '15 at 9:25
Community♦
111 silver badge
answered Oct 31 '12 at 0:31
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Efficiency of purely functional programming
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According to Pippenger [1996], when comparing a Lisp system that is purely functional (and has strict evaluation semantics, not lazy) to one that can mutate data, an algorithm written for the impure Lisp that runs in O(n) can be translated to an alg...
Favorite Visual Studio keyboard shortcuts [closed]
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124 Answers
124
Active
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grunt: command not found when running from terminal
...e nano version will also work as described here http://architectryan.com/2012/10/02/add-to-the-path-on-mac-os-x-mountain-lion/ but a restart of Terminal may be required to have the new path picked up.
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Check if all checkboxes are selected
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261
I think the easiest way is checking for this condition:
$('.abc:checked').length == $('.abc').l...
In Python, how do I index a list with another list?
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answered Jun 18 '09 at 11:38
vanvan
56.4k99 gold badges129129 silver badges140140 bronze badges
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What's the difference between equal?, eql?, ===, and ==?
...ngs which have interesting === implementations:
Range
Regex
Proc (in Ruby 1.9)
So you can do things like:
case some_object
when /a regex/
# The regex matches
when 2..4
# some_object is in the range 2..4
when lambda {|x| some_crazy_custom_predicate }
# the lambda returned true
end
See my ans...