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Append a NumPy array to a NumPy array
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234
In [1]: import numpy as np
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array([...
Meaning of $? (dollar question mark) in shell scripts
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214
This is the exit status of the last executed command.
For example the command true always retur...
How do I concatenate const/literal strings in C?
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401
In C, "strings" are just plain char arrays. Therefore, you can't directly concatenate them wit...
Sort array of objects by single key with date value
...
Here's an example:
var arr = [{
"updated_at": "2012-01-01T06:25:24Z",
"foo": "bar"
},
{
"updated_at": "2012-01-09T11:25:13Z",
"foo": "bar"
},
{
"updated_at": "2012-01-05T04:13:24Z",
"foo": "bar"
}
]
arr.sort(function(a, b) {
var keyA = new Dat...
How to get method parameter names?
...s variables, and the defaults provided. ie.
>>> def foo(a, b, c=4, *arglist, **keywords): pass
>>> inspect.getfullargspec(foo)
(['a', 'b', 'c'], 'arglist', 'keywords', (4,))
Note that some callables may not be introspectable in certain implementations of Python. For Example, in...
LINQ Aggregate algorithm explained
... carries forward. etc.
Example 1. Summing numbers
var nums = new[]{1,2,3,4};
var sum = nums.Aggregate( (a,b) => a + b);
Console.WriteLine(sum); // output: 10 (1+2+3+4)
This adds 1 and 2 to make 3. Then adds 3 (result of previous) and 3 (next element in sequence) to make 6. Then adds 6 and 4 t...
C dynamically growing array
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answered Aug 21 '10 at 4:01
casablancacasablanca
64.3k55 gold badges121121 silver badges142142 bronze badges
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...libc malloc版本。
ptmalloc原理
系统调用接口
上图是 x86_64 下 Linux 进程的默认地址空间, 对 heap 的操作, 操作系统提供了brk()系统调用，设置了Heap的上边界； 对 mmap 映射区域的操作,操作系 统 供了 mmap()和 munmap()函数。
因为系统...
Are there benefits of passing by pointer over passing by reference in C++?
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edited Nov 14 '12 at 16:01
Lightness Races in Orbit
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Indenting #defines
..." and the identifier) you prefer.
http://www.delorie.com/gnu/docs/gcc/cpp_48.html
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