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How do I create directory if none exists using File class in Ruby?
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I added a core-only solution to my answer: Be aware, however, that it essentially reimplements FileUtils.mkdir_p (which is the method dedicated to your use case)
– Eureka
Sep 27 '12 at 9:12
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Numpy: Get random set of rows from 2D array
...-sample your data by a certain factor. Say I want to down-sample to 25% of my original data set, which is currently held in the array data_arr:
# generate random boolean mask the length of data
# use p 0.75 for False and 0.25 for True
mask = numpy.random.choice([False, True], len(data_arr), p=[0.75...
Import SQL file into mysql
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From the mysql console:
mysql> use DATABASE_NAME;
mysql> source path/to/file.sql;
make sure there is no slash before path if you are referring to a relative path... it took me a while to realize that! lol
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How to make link look like a button?
... easily wrap a button with a link like so <a href="#"> <button>my button </button> </a>
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How to get child element by class name?
...hat equals "small bigger". If you're looking for a class called big saying myElement.className.indexOf("big") will produce something unequal to negative 1 despite that not actually being a part of the class. If you have 100% control of your class names, such a fix would work, it's just not guarantee...
how to get request path with express req object
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After having a bit of a play myself, you should use:
console.log(req.originalUrl)
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Should I use past or present tense in git commit messages? [closed]
... be in the imperative present tense, e.g. "Add tests for x". I always find myself using the past tense, e.g. "Added tests for x" though, which feels a lot more natural to me.
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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...r (a*a*a)*(a*a*a). Just to provide some data, I ran a small experiment on my Mac Pro, measuring the worst error in evaluating a^6 for all single-precision floating numbers between [1,2):
worst relative error using powf(a, 6.f): 5.96e-08
worst relative error using (a*a*a)*(a*a*a): 2.94e-07
worst...
How to update a single library with Composer?
I need to install only 1 package for my SF2 distribution (DoctrineFixtures).
8 Answers
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Erlang's 99.9999999% (nine nines) reliability
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As I explained in my answer, this figure was not based on 20 years of AXD301 operation. It was based on 14 nodes over an 8-month period in a single trial by British Telecom. This is hardly representative of the whole AXD301 line's operational ...