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how to solve “ruby installation is missing psych” error?
I used rvm to install ruby 1.9.3. even though it was successfully installed, it complained about libyaml. and now every time i wanna install a gem (say rails) this warning shows up:
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How to determine the number of days in a month in SQL Server?
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116
You can use the following with the first day of the specified month:
datediff(day, @date, dat...
Finding the index of an item in a list
..., "bar", "baz"] and an item in the list "bar" , how do I get its index ( 1 ) in Python?
31 Answers
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Push git commits & tags simultaneously
...gt;
(Note: this actually work with HTTPS only with Git 2.24)
Update May 2015
As of git 2.4.1, you can do
git config --global push.followTags true
If set to true enable --follow-tags option by default.
You may override this configuration at time of push by specifying --no-follow-tags.
As noted in...
Generate array of all letters and digits
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145
[*('a'..'z'), *('0'..'9')] # doesn't work in Ruby 1.8
or
('a'..'z').to_a + ('0'..'9').to_a ...
What is in your Mathematica tool bag? [closed]
...t have that tag. The items retain their original order, so if you set h = #1& then you get an unsorted Union, like in the examples for Reap. But, it can be used for secondary processing.
As an example of its utility, I've been working with Wannier90 which outputs the spatially dependent Hamilt...
Check substring exists in a string in C
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12 Answers
12
Active
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Get the first element of each tuple in a list in Python [duplicate]
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196
Use a list comprehension:
res_list = [x[0] for x in rows]
Below is a demonstration:
>&g...
Declaring and initializing variables within Java switches
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114
Switch statements are odd in terms of scoping, basically. From section 6.3 of the JLS:
The...
How to get a substring of text?
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edited Aug 17 '12 at 10:25
answered May 31 '11 at 8:14
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