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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
...ior applies to any default value that is subsequently mutated (e.g. hashes and strings), not just arrays.
TL;DR: Use Hash.new { |h, k| h[k] = [] } if you want the most idiomatic solution and don’t care why.
What doesn’t work
Why Hash.new([]) doesn’t work
Let’s look more in-depth at why...
Use of an exclamation mark in a Git commit message via the command line
How do I enter an exclamation point into a Git commit message from the command line?
6 Answers
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Set Viewbag before Redirect
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I would like to complete the answer because I am using it and I faced a small problem that is when the TempData is empty for some reason (in my case I only have a message when a conversion is made). So I had to had the test if(TempData["Message"] != null) to avoid an error.
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Why can't I forward-declare a class in a namespace using double colons?
...viously declared) entities. They can't be used to introduce new entities.
And you are in fact "reopening" the namespace to declare new entities. If the class Class is later defined as a member of different namespace - it is a completely different class that has nothing to do with the one you declar...
Should I use a data.frame or a matrix?
When should one use a data.frame , and when is it better to use a matrix ?
6 Answers
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Numpy: Divide each row by a vector element
...ewaxes is a great way to do this.
Another alternative is to use transposes and broadcasting, as in
(data.T - vector).T
and
(data.T / vector).T
For higher dimensional arrays you may want to use the swapaxes method of NumPy arrays or the NumPy rollaxis function.
There really are a lot of ways to...
What does the 'Z' mean in Unix timestamp '120314170138Z'?
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Yes. 'Z' stands for Zulu time, which is also GMT and UTC.
From http://en.wikipedia.org/wiki/Coordinated_Universal_Time:
The UTC time zone is sometimes denoted by the letter Z—a reference to
the equivalent nautical time zone (GM...
How to find the installed pandas version
I am having trouble with some of pandas functionalities. How do I check what is my installation version?
6 Answers
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Best approach for designing F# libraries for use from both F# and C#
...sign a library in F#. The library should be friendly for use from both F# and C# .
4 Answers
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Generate array of all letters and digits
Using ruby, is it possible to make an array of each letter in the alphabet and 0-9 easily?
7 Answers
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