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Set time part of DateTime in ruby
...Be aware that DateTime.now.midnight does not return 24:00:00 as you might expect, it returns 00:00:00 - the same value as beginning_of_day. See my answer as to why this could be important in some scenarios.
– rmcsharry
Apr 13 '16 at 11:06
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How to compare two colors for similarity/difference
...nd compute deltaE between your two Lab* values. It's not computationally expensive, it's just some nonlinear formulas and some multiplies and adds.
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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
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How to add a new row to an empty numpy array
...; arr
array([], shape=(0, 3), dtype=int64)
Then be sure to append along axis 0:
arr = np.append(arr, np.array([[1,2,3]]), axis=0)
arr = np.append(arr, np.array([[4,5,6]]), axis=0)
But, @jonrsharpe is right. In fact, if you're going to be appending in a loop, it would be much faster to append t...
sed whole word search and replace
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\b in regular expressions match word boundaries (i.e. the location between the first word character and non-word character):
$ echo "bar embarassment" | sed "s/\bbar\b/no bar/g"
no bar embarassment
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Why is '+' not understood by Python sets?
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I'm not sure it does; "Because it is blue" does not explain "Why is the sky blue?"
– SingleNegationElimination
Oct 8 '11 at 17:20
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Understanding ibeacon distancing
...tooth-lowenergy/BLE) can work. Is there any true documentation on how far exactly an ibeacon can measure. Lets say I am 300 feet away...is it possible for an ibeacon to detect this?
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Apache VirtualHost 403 Forbidden
...equire all denied
This basically says to deny access to all users. To fix this problem, either remove the denied directive (or much better) add the following directive to the directories you want to grant access to:
Require all granted
as in
<Directory "your directory here">
Order a...
How to write a Unit Test?
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Define the expected and desired output for a normal case, with correct input.
Now, implement the test by declaring a class, name it anything (Usually something like TestAddingModule), and add the testAdd method to it (i.e. like the one ...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网移动版 - 专注IT技能提升
Nginx url重写rewrite实例详解Nginx_url_rewriteNginx url重写 rewrite在nginx中实现url重写，学习rewrite的具体用法，包括301重定向的内容等，希望对大家有所帮助。nginx rewrite 实现二级域名跳转
当访问http://www.jbyuan.com跳转到http://www.jbyuan.com/nv...