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mongodb count num of distinct values per field/key
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199
MongoDB has a distinct command which returns an array of distinct values for a field; you can ...
XPath query to get nth instance of an element
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251
This is a FAQ:
//somexpression[$N]
means "Find every node selected by //somexpression that is ...
pass **kwargs argument to another function with **kwargs
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163
In the second example you provide 3 arguments: filename, mode and a dictionary (kwargs). But P...
How to change the default font size in ggplot2
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118
Use theme_set()
theme_set(theme_gray(base_size = 18))
qplot(1:10, 1:10)
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Javascript: Round up to the next multiple of 5
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edited Sep 23 '13 at 7:32
answered Sep 23 '13 at 7:03
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How to calculate a Mod b in Casio fx-991ES calculator
Does anyone know how to calculate a Mod b in Casio fx-991ES Calculator. Thanks
10 Answers
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'float' vs. 'double' precision
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146
Floating point numbers in C use IEEE 754 encoding.
This type of encoding uses a sign, a signi...
What is the difference between Python's list methods append and extend?
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append: Appends object at the end.
x = [1, 2, 3]
x.append([4, 5])
print (x)
gives you: [1, 2, 3, [4, 5]]
extend: Extends list by appending elements from the iterable.
x = [1, 2, 3]
x.extend([4, 5])
print (x)
gives you: [1, 2, 3, 4, 5]
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Is \d not supported by grep's basic expressions?
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197
grep's default mode is (iirc) POSIX regex, and \d is pcre. You can either pass -P to gnu grep,...
Active Record - Find records which were created_at before today
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165
Using ActiveRecord the standard way:
MyModel.where("created_at < ?", 2.days.ago)
Using t...