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How to get values from IGrouping
... codidact.com
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answered Dec 15 '11 at 13:56
Matt SmithMatt Smith
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What does .SD stand for in data.table in R
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3 Answers
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Merge a Branch into Trunk
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GreenAsJade
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answered Oct 3 '11 at 18:02
blahdiblahblahdibl...
Finding the index of elements based on a condition using python list comprehension
... of a list.
>>> import numpy
>>> a = numpy.array([1, 2, 3, 1, 2, 3])
>>> a
array([1, 2, 3, 1, 2, 3])
>>> numpy.where(a > 2)
(array([2, 5]),)
>>> a > 2
array([False, False, True, False, False, True], dtype=bool)
>>> a[numpy.where(a > 2...
Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
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As Sven mentioned, x[[[0],[2]],[1,3]] will give back the 0 and 2 rows that match with the 1 and 3 columns while x[[0,2],[1,3]] will return the values x[0,1] and x[2,3] in an array.
There is a helpful function for doing the first example I gave, numpy.ix_. Y...
dplyr: “Error in n(): function should not be called directly”
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Michael Bellhouse
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answered Apr 2 '14 at 3:59
mnelmnel
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Change the name of the :id parameter in Routing resources for Rails
...ms to do exactly what you're looking for. You can take a look at the Rails 3 code compared to the Rails 4 code.
Details
You can easily implement this in your routes.rb file:
# config/routes.rb
resources :posts, param: :slug
# app/controllers/posts_controller.rb
# ...
@post = Post.find_by(slug:...
How do I specify different Layouts in the ASP.NET MVC 3 razor ViewStart file?
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3 Answers
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How to override to_json in Rails?
...Longer explanation of to_json, as_json, and rendering:
In ActiveSupport 2.3.3, as_json was added to address issues like the one you have encountered. The creation of the json should be separate from the rendering of the json.
Now, anytime to_json is called on an object, as_json is invoked to creat...