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Why do we check up to the square root of a prime number to determine if it is prime?
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If a number n is not a prime, it can be factored into two factors a and b:
n = a * b
Now a and b can't be both greater than the square root of n, since then the product a * b would be greater than sqrt(n) * sqrt(n) = n. So in any factorization of n, at least one of the factors must be smal...
Can't update Macports (with Mac OS X Mavericks)
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Install the "Command Line Tools" first:
sudo xcode-select --install
(Explicitly agreeing to the license is sometimes necessary via "sudo xcodebuild -license")
Then upgrade the ports:
sudo port -v selfupdate
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How to “git clone” including submodules?
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With version 2.13 of Git and later, --recurse-submodules can be used instead of --recursive:
git clone --recurse-submodules -j8 git://github.com/foo/bar.git
cd bar
Editor’s note: -j8 is an optional performance optimization that became available ...
How to keep index when using pandas merge
I would like to merge two DataFrames , and keep the index from the first frame as the index on the merged dataset. However, when I do the merge, the resulting DataFrame has integer index. How can I specify that I want to keep the index from the left data frame?
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How do you get the Git repository's name in some Git repository?
... get the Git repository name in some Git repository? Are there any Git commands?
17 Answers
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Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
I have installed MySQL server and trying to connect to it, but getting the error:
18 Answers
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Android Studio Checkout Github Error “CreateProcess=2” (Windows)
Today I've tried to checkout my Github project using brand new Android Studio and ended up with this nasty error :
9 Answer...
Site stopped working in asp.net System.Web.WebPages.Razor.Configuration.HostSection cannot be cast t
...g contains the proper version for the assembly "System.Web.WebPages.Razor" and "System.Web.Mvc". Check for their actual existence as well as my "System.Web.WebPages.Razor" assembly tag was missing causing the error. I had my assembly versions set to 3.0 and 5.0 respectively in the time of this writ...
Python strptime() and timezones?
... your example to time.strptime doesn't work but if you strip off the " %Z" and the " EST" it does work. Also using "UTC" or "GMT" instead of "EST" works. "PST" and "MEZ" don't work. Puzzling.
It's worth noting this has been updated as of version 3.2 and the same documentation now also states the fo...
Bootstrap NavBar with left, center or right aligned items
...te a navigation bar that has Logo A on the left, menu items in the center, and Logo B on the right?
10 Answers
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