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Using numpy to build an array of all combinations of two arrays
...implementation:
@pv's solution
In [113]:
%timeit cartesian(([1, 2, 3], [4, 5], [6, 7]))
10000 loops, best of 3: 135 µs per loop
In [114]:
cartesian(([1, 2, 3], [4, 5], [6, 7]))
Out[114]:
array([[1, 4, 6],
[1, 4, 7],
[1, 5, 6],
[1, 5, 7],
[2, 4, 6],
[2, 4, 7],...
Remove duplicate elements from array in Ruby
... |
edited May 20 at 4:57
the Tin Man
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What's the difference between “mod” and “remainder”?
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145
There is a difference between modulus and remainder. For example:
-21 mod 4 is 3 because -21 +...
Programmatically obtain the Android API level of a device?
...llowing way (it will execute if the current device's API level is at least 4)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.DONUT) {
}
To obtain user visible Android Version use:
Build.VERSION.RELEASE
share
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LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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销地
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A1
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60
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How do you rotate a two dimensional array?
Inspired by Raymond Chen's post , say you have a 4x4 two dimensional array, write a function that rotates it 90 degrees. Raymond links to a solution in pseudo code, but I'd like to see some real world stuff.
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Validating IPv4 addresses with regexp
I've been trying to get an efficient regex for IPv4 validation, but without much luck. It seemed at one point I had had it with (25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4} , but it produces some strange results:
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How to return a part of an array in Ruby?
...", "c" ]
a[1..3] #=> [ "b", "c", "d" ]
a[4..7] #=> [ "e" ]
a[6..10] #=> nil
a[-3, 3] #=> [ "c", "d", "e" ]
# special cases
a[5] #=> nil
a[6, 1] ...
How can I delete one element from an array by value
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490
I think I've figured it out:
a = [3, 2, 4, 6, 3, 8]
a.delete(3)
#=> 3
a
#=> [2, 4, 6, 8...