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Overload constructor for Scala's Case Classes?
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retronymretronym
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How to switch to REPLACE mode in VIM
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edited Mar 27 '16 at 7:30
Willem Van Onsem
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git discard all changes and pull from upstream
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edited Jan 3 '19 at 18:02
answered Dec 8 '12 at 20:08
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Scala: What is a TypeTag and how do I use it?
...List[Foo] => "list of foos"
}
we will get warnings:
<console>:23: warning: non-variable type argument String in type pattern List[String]↩
is unchecked since it is eliminated by erasure
case _: List[String] => "list of strings"
^
<console>:24: warning...
Creating PHP class instance with a string
...er cool stuff you can do in php are:
Variable variables:
$personCount = 123;
$varname = 'personCount';
echo $$varname; // echo's 123
And variable functions & methods.
$func = 'my_function';
$func('param1'); // calls my_function('param1');
$method = 'doStuff';
$object = new MyClass();
$objec...
Math.random() versus Random.nextInt(int)
...s in its mantissa, so it is uniformly distributed in the range 0 to 1-(2^-53).
Random.nextInt(n) uses Random.next() less than twice on average- it uses it once, and if the value obtained is above the highest multiple of n below MAX_INT it tries again, otherwise is returns the value modulo n (th...
Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?
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Java Concurrency in Practice discusses this in more detail in Chapter 7.1.3: Responding to Interruption. Its rule is:
Only code that implements a thread's interruption policy may swallow an interruption request. General-purpose task and library code should never swallow interruption requests.
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How do I tell Matplotlib to create a second (new) plot, then later plot on the old one?
...re and plot data2, and finally come back to the original plot and plot data3, kinda like this:
4 Answers
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How do you get the magnitude of a vector in Numpy?
...ray -- say x.norm() -- but oh well).
import numpy as np
x = np.array([1,2,3,4,5])
np.linalg.norm(x)
You can also feed in an optional ord for the nth order norm you want. Say you wanted the 1-norm:
np.linalg.norm(x,ord=1)
And so on.
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How do I prevent a Gateway Timeout with FastCGI on Nginx
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answered Feb 18 '09 at 19:34
zgodazgoda
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