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深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...，中断系统此时是不可用的，那么由 ROM BIOS 设置 IVT 。
1.1 中断向量表（IVT）
IDTR.base 被初始化为 0，ROM BIOS 将不会对 IDTR.base 进行更改，因此如果实模式 OS 不更改 IDTR.base 的值，这意味着 IVT 在 0 的位置上，典型的如： DOS 操作...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...e can pick any numbers we like:
# estimates for the mean
red_mean_guess = 1.1
blue_mean_guess = 9
# estimates for the standard deviation
red_std_guess = 2
blue_std_guess = 1.7
These parameter estimates produce bell curves that look like this:
These are bad estimates. Both means (the vertical ...
What are the main disadvantages of Java Server Faces 2.0?
...ou'd intuitively expect. You as developer would run hard away crying.
JSF 1.1 (May 2004)
This was the bugfix release. The performance was still not much improved. There was also one major disadvantage: you can't inline HTML in the JSF page flawlessly. All plain vanilla HTML get rendered before the...
SQL JOIN and different types of JOINs
...nt but the table must join with itself.
For more information:
Examples:
1.1: INNER-JOIN: Equi-join implementation
SELECT *
FROM Table1 A
INNER JOIN Table2 B ON A.<Primary-Key> =B.<Foreign-Key>;
1.2: INNER-JOIN: Natural-JOIN implementation
Select A.*, B.Col1, B.Col2 --B...
Pretty-print C++ STL containers
...:string> j;
j.insert("hello");
j.insert("world");
double k[] = { 1.1, 2.2, M_PI, -1.0/123.0 };
std::cout << i << "\n" << j << "\n" << k << "\n";
}
It currently only works with vector and set, but can be made to work with most containers, just by exp...
Fastest way to iterate over all the chars in a String
...lls.
THIRD UPDATE: As of 2020-09-07, on my Ryzen 1950-X 16 core and source 1.14, 'charAt1' is 9 times slower than field access and 'charAt2' is 4 times slower than field access. Field access is back as the clear winner. Note than the program will need to use byte[] access for Java 9+ version jvms.
I...
Callback functions in C++
...ave.
Let's have a simple function foo:
int foo (int x) { return 2+x; }
1.1 Writing a function pointer / type notation
A function pointer type has the notation
return_type (*)(parameter_type_1, parameter_type_2, parameter_type_3)
// i.e. a pointer to foo has the type:
int (*)(int)
where a na...
AI2 Keep Awake
... Version Adjustments 1.0 (2024-10-28) Initial Version 1.1 (2024-11-03) Internal adjustments Notice: The lifespan of the device battery will be significantly reduced by using this extension. Do not set WakeLocks if you do not really need them, use them as rarely as pos...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...WEB服务。怎么保证三台服务器中的数据一样呢？
1.1最开始的解决方案：
在其中一台服务器上开启NFS服务，其他两台服务器挂着NFS目录。所有非结构化和可变数据放在NFS目录里面。这样一来解决了三台服务器内容一致...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...模型都都要在该窗口内编码实现。下面举两个例子。
例1.1 如何在LINGO中求解如下的LP问题：
在模型窗口中输入如下代码：
min=2*x1+3*x2;
x1+x2>=350;
x1>=100;
2*x1+x2<=600;
然后点击工具条上的按钮 即可。
例1.2 使用LINGO软件计算6...