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How to sort a list in Scala by two fields?
... @SachinK: You could implement customOrdering as Ordering[Row] manually or using Ordering.by like this: val customOrdering = Ordering.by((r: Row) => (r.lastName, r.firstName))( Ordering.Tuple2(Ordering.String.reverse, Ordering.String) )`
– senia
Jun ...
What predefined macro can I use to detect clang?
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To get a list of all the predefined macros that the compiler uses, use this:
clang -dM -E -x c /dev/null
You can do the same for gcc.
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Finding local maxima/minima with Numpy in a 1D numpy array
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If you are looking for all entries in the 1d array a smaller than their neighbors, you can try
numpy.r_[True, a[1:] < a[:-1]] & numpy.r_[a[:-1] < a[1:], True]
You could also smooth your array before this step using numpy.convolve().
I...
How to enable cross-origin resource sharing (CORS) in the express.js framework on node.js
...tatic files from a public directory. I'm using the express.js and am not really sure how to allow cross-domain scripting ( Access-Control-Allow-Origin: * ).
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Convert a python 'type' object to a string
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print type(someObject).__name__
If that doesn't suit you, use this:
print some_instance.__class__.__name__
Example:
class A:
pass
print type(A())
# prints <type 'instance'>
print A().__class__.__name__
# prints A
Also, it seems th...
jQuery: serialize() form and other parameters
...onment, then none of these answers should be used. The form should contain all information (in hidden fields if necessary) so that it can be serialised in a single call. This way if JS is disabled or fails, the form submission should still have a failsafe and include all data when sent.
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Django FileField with upload_to determined at runtime
...eed to use the filename given - you could override that in your upload_to callable too if you liked.
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Best way to give a variable a default value (simulate Perl ||, ||= )
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In PHP 7 we finally have a way to do this elegantly. It is called the Null coalescing operator. You can use it like this:
$name = $_GET['name'] ?? 'john doe';
This is equivalent to
$name = isset($_GET['name']) ? $_GET['name']:'john doe'...
WebService Client Generation Error with JDK8
.../jre/lib and then write this line in it:
javax.xml.accessExternalSchema = all
That's all. Enjoy JDK 8.
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How to check if an email address exists without sending an email?
...here are two methods you can sometimes use to determine if a recipient actually exists:
You can connect to the server, and issue a VRFY command. Very few servers support this command, but it is intended for exactly this. If the server responds with a 2.0.0 DSN, the user exists.
VRFY user
You can...