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How to rename a single column in a data.frame?
I know if I have a data frame with more than 1 column, I can use
20 Answers
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How to merge two sorted arrays into a sorted array? [closed]
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answer[k++] = b[j++];
return answer;
}
Is a little bit more compact but exactly the same!
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How to create an array of 20 random bytes?
...om();
byte[] bytes = new byte[20];
random.nextBytes(bytes);
Java 8 (even more secure):
byte[] bytes = new byte[20];
SecureRandom.getInstanceStrong().nextBytes(bytes);
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HEAD and ORIG_HEAD in Git
...of HEAD, ORIG_HEAD is last value of HEAD before dangerous operation).
For more information read git(1) manpage, Git User's Manual, the Git Community Book and Git Glossary
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NOT IN vs NOT EXISTS
...is altered in the future to allow NULLs the NOT IN version will need to do more work (even if no NULLs are actually present in the data) and the semantics of NOT IN if NULLs are present are unlikely to be the ones you want anyway.
When neither Products.ProductID or [Order Details].ProductID allow N...
Django - iterate number in for loop of a template
...forloop.counter0 }} # starting index 0
# do your stuff
{% endfor %}
More info at: for | Built-in template tags and filters | Django documentation
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How to elegantly deal with timezones
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Not that this is a recommendation, its more sharing of a paradigm, but the most agressive way I've seen of handling timezone information in a web app (which is not exclusive to ASP.NET MVC) was the following:
All date times on the server are UTC.
That means using...
Calling a function every 60 seconds
...e queued. This means that your callback may (and probably will) fire after more than 60 seconds.
– Andy E
Jun 29 '10 at 7:52
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How to compile a 64-bit application using Visual C++ 2010 Express?
... "v100" to "Windows7.1SDK".
These steps have worked for me, anyway. Some more details on step 2 can be found in a reference from Microsoft that a previous poster mentioned: http://msdn.microsoft.com/en-us/library/9yb4317s.aspx.
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Display a tooltip over a button using Windows Forms
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nice, but a question: if I have more than one button in a form, I need more tooltip or I can set multiple descriptions and buttons for the same tooltip?
– ghiboz
Apr 23 '14 at 17:24
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