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Formula to determine brightness of RGB color
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20 Answers
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How to shift a column in Pandas DataFrame
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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
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2435
You can use these ANSI escape codes:
Black 0;30 Dark Gray 1;30
Red 0...
Print list without brackets in a single row
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Storing sex (gender) in database
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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...
Force LF eol in git repo and working copy
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237
Without a bit of information about what files are in your repository (pure source code, images...
Active Record - Find records which were created_at before today
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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...
How can I redirect the output of the “time” command?
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edited Mar 9 '10 at 12:37
Motti
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answe...
What's the difference between console.dir and console.log?
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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...
how to convert binary string to decimal?
... base in which the string representation is:
var digit = parseInt(binary, 2);
See it in action.
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