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Why is pow(a, d, n) so much faster than a**d % n?
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See the Wikipedia article on modular exponentiation. Basically, when you do a**d % n, you actually have to calculate a**d, which could be quite large. But there are ways of computing a**d % n without having to compute a**d itself, and that is what pow does. The ** operator can't do this because ...
How to select a CRAN mirror in R
I'm trying to install a package through the R prompt by doing the following:
11 Answers
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Propagate all arguments in a bash shell script
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This does this work for pure pass through of quoted/escaped strings: Observe: cat rsync_foo.sh #!/bin/bash echo "$@" rsync "$@" ./rsync_foo.sh -n "bar me" bar2 bar me bar2skipping directory bar me ...
How to do ssh with a timeout in a script?
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This doesn't actually work for "the remote host is taking an infinite time to run": "ssh -o ConnectTimeout=5 host 'sleep 10'" waits for 10 seconds, not 5.
– Ferry Boender
Oct 11 '16 at 18:37
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How to use the IEqualityComparer
... want to get all of them without duplication. I created a compare class to do this work, but the execution of the function causes a big delay from the function without distinct, from 0.6 sec to 3.2 sec!
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node.js global variables?
...javascript or part of node? Is it a good pattern to follow? As in should I do this or should I use express set? Thanks
– Harry
Mar 28 '11 at 3:34
4
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How do I automatically sort a has_many relationship in Rails?
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As of Rails 4, you would do:
class Article < ActiveRecord::Base
has_many :comments, -> { order(created_at: :desc) }
end
class Comment < ActiveRecord::Base
belongs_to :article
end
For a has_many :through relationship the argument o...
What does “for” attribute do in HTML tag?
...ttribute is bound to the input by the id attribute, and the name attribute does not have to match. <label for="theinput">Input here:</label> <input type='text' name='notmatching' id='theinput'> Will still work
– Glo
Jan 15 '15 at 14:35
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How do I change the font size of a UILabel in Swift?
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You can do it like this:
label.font = UIFont(name: label.font.fontName, size: 20)
Or like this:
label.font = label.font.withSize(20)
This will use the same font. 20 can be whatever size you want of course.
Note: The latter opt...
How do I bind to list of checkbox values with AngularJS?
...me filterNameFilter ("filterName" should be in italics) -- $filterProvider docs
– Mark Rajcok
Jan 25 '13 at 19:04
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