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Formula to determine brightness of RGB color

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How to shift a column in Pandas DataFrame

... In [18]: a Out[18]: x1 x2 0 0 5 1 1 6 2 2 7 3 3 8 4 4 9 In [19]: a.x2 = a.x2.shift(1) In [20]: a Out[20]: x1 x2 0 0 NaN 1 1 5 2 2 6 3 3 7 4 4 8 ...
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How to change the output color of echo in Linux

... 2435 You can use these ANSI escape codes: Black 0;30 Dark Gray 1;30 Red 0...
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Print list without brackets in a single row

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Storing sex (gender) in database

...----------------------------------------- TinyINT 1 255 (zero to 255) INT 4 - 2,147,483,648 to 2,147,483,647 BIT 1 (2 if 9+ columns) 2 (0 and 1) CHAR(1) 1 26 if case insensitive, 52 otherwise The BIT data type can be r...
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Force LF eol in git repo and working copy

... 237 Without a bit of information about what files are in your repository (pure source code, images...
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Active Record - Find records which were created_at before today

... Using ActiveRecord the standard way: MyModel.where("created_at < ?", 2.days.ago) Using the underlying Arel interface: MyModel.where(MyModel.arel_table[:created_at].lt(2.days.ago)) Using a thin layer over Arel: MyModel.where(MyModel[:created_at] < 2.days.ago) Using squeel: MyModel.w...
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How can I redirect the output of the “time” command?

... | edited Mar 9 '10 at 12:37 Motti 95.3k4242 gold badges176176 silver badges242242 bronze badges answe...
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What's the difference between console.dir and console.log?

..... You can also see a clear difference with arrays (e.g., console.dir([1,2,3])) which are logged differently from normal objects: > console.log([1,2,3]) [1, 2, 3] > console.dir([1,2,3]) * Array[3] 0: 1 1: 2 2: 3 length: 3 * __proto__: Array[0] concat: function c...
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how to convert binary string to decimal?

... base in which the string representation is: var digit = parseInt(binary, 2); See it in action. share | improve this answer | follow | ...