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List of Big-O for PHP functions
...res a linear poll.
Obvious Big-O:
array_fill O(n)
array_fill_keys O(n)
range O(n)
array_splice O(offset + length)
array_slice O(offset + length) or O(n) if length = NULL
array_keys O(n)
array_values O(n)
array_reverse O(n)
array_pad O(pad_size)
array_flip O(n)
array_sum O(n)
array_produ...
Python: Making a beep noise
...
This one is neat: def annoy(): for i in range(1, 10): winsound.Beep(i * 100, 200)
– Skurmedel
Jun 30 '11 at 15:56
...
How to animate the change of image in an UIImageView?
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simple and opens up a whole range of other animation effects between the images.
– So Over It
Oct 6 '13 at 17:28
1
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BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... = 0x11, /* 设备安全管理OOB标志 */
BLE_AD_TYPE_INT_RANGE = 0x12, /* 设备连接参数范围 */
BLE_AD_TYPE_SOL_SRV_UUID = 0x14, /* 设备16bit服务UUID */
BLE_AD_TYPE_128SOL_SRV_UUID = 0x15, /* 设备128bit服务UUID */...
How to add property to a class dynamically?
...or k,v in kwargs.items():
setattr(self, k, v)
for i in range(len(iargs)):
setattr(self, args[i], iargs[i])
for k,v in ikwargs.items():
setattr(self, k, v)
name = kwargs.pop("name", "MyStruct")
kwargs.update(dict((k, None) for k in args))
...
Can you get the column names from a SqlDataReader?
...++)
{
columns.Add(reader.GetName(i));
}
or
var columns = Enumerable.Range(0, reader.FieldCount).Select(reader.GetName).ToList();
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Convert light frequency to RGB?
...he important point that some colours are not representable in RGB (bright oranges being a good example) because you cannot "make" arbitrary colours of light by adding three primary colours together, whatever our physics teachers may have told us (well mine did). Too bad, but in practice not usually ...
Append a NumPy array to a NumPy array
...andom numbers to a 10 X 10 matrix.
myNpArray = np.zeros([1, 10])
for x in range(1,11,1):
randomList = [list(np.random.randint(99, size=10))]
myNpArray = np.vstack((myNpArray, randomList))
myNpArray = myNpArray[1:]
Using np.zeros() an array is created with 1 x 10 zeros.
array([[0., 0., 0....
How to generate a random number between a and b in Ruby?
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UPDATE: Ruby 1.9.3 Kernel#rand also accepts ranges
rand(a..b)
http://www.rubyinside.com/ruby-1-9-3-introduction-and-changes-5428.html
Converting to array may be too expensive, and it's unnecessary.
(a..b).to_a.sample
Or
[*a..b].sample
Array#sample
Stan...
Accessing items in an collections.OrderedDict by index
... from indexed import IndexedOrderedDict
In [3]: id=IndexedOrderedDict(zip(arange(1000),random.random(1000)))
In [4]: timeit id.keys()[56]
1000000 loops, best of 3: 969 ns per loop
In [8]: from collections import OrderedDict
In [9]: od=OrderedDict(zip(arange(1000),random.random(1000)))
In [10]: time...