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一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术
...和付款金额。只要账簿的初始状态确定，每一笔交易记录可靠并有时序，当前每个人持有多少钱是可以推算出来的。
账簿由私有改为公开，只要任何村民需要，都可以获得当前完整的账簿，账簿上记录了从账簿创建开始到当前...
How to convert PascalCase to pascal_case?
... => 'easy',
'HTML' => 'html',
'simpleXML' => 'simple_xml',
'PDFLoad' => 'pdf_load',
'startMIDDLELast' => 'start_middle_last',
'AString' => 'a_string',
'Some4Numbers234' => 'some4_numbers234',
'TEST123String' => 'test123_string',
);
foreach ($tests as $test =>...
Converting a Uniform Distribution to a Normal Distribution
...so shared by the inverse CDF method. See cimat.mx/~src/prope08/randomgauss.pdf . This can be alleviated by using a uniform RNG which has non zero probability to yield a floating point number very close to zero. Most RNG do not, since they generate a (typically 64 bit) integer which is then mapped to...
Generate random numbers with a given (numerical) distribution
...se home-grown solutions just weren't succinct enough for your liking. :-)
pdf = [(1, 0.1), (2, 0.05), (3, 0.05), (4, 0.2), (5, 0.4), (6, 0.2)]
cdf = [(i, sum(p for j,p in pdf if j < i)) for i,_ in pdf]
R = max(i for r in [random.random()] for i,c in cdf if c <= r)
I pseudo-confirmed that th...
Linux equivalent of the Mac OS X “open” command [closed]
...ngs correctly open in VLC, .txt files open in less (instead of gedit) and .pdf files simply fail to open! ( Error: no "view" mailcap rules found for type "application/pdf")
– MestreLion
Sep 11 '12 at 21:36
...
App Inventor 2 蓝牙发送十六进制字节方案：文本转Hex字节详解 - App应用开...
...小。相比 WriteStrings 有23字节硬编码截断问题，WriteBytes 更可靠。
3. WriteShorts 能实现吗？WriteShorts 发送的是 16位短整型值（每值2字节），unsigned范围 0~65535。
用 WriteShorts 实现的思路：把 "ABCD" 拆成两个字符对，合成一个16...
How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
...lick Save.
The diagram is exported. To export in a vector format, use To PDF File, instead. This allows for simplified editing using Inkscape (or other vector image editor).
These instructions may work for SQL Developer 3.2.09.23 to 4.1.3.20.
...
tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...
...（经过2MSL，上一次连接中所有的重复包都会消失）
2。可靠的关闭TCP连接。在主动关闭方发送的最后一个 ack(fin) ，有可能丢失，这时被动方会重新发
fin, 如果这时主动方处于 CLOSED 状态 ，就会响应 rst 而不是 ack。所以主动方要...
Generating HTML email body in C#
...;
var file = new Attachment(fileStream, MediaTypeNames.Application.Pdf);
file.Name = "FILE.PDF";
msg.Attachments.Add(file);
// Send the email
var client = new SmtpClient(...);
client.Credentials = new NetworkCredential(...);
client.Send(msg)...
How to use the “number_to_currency” helper method in the model rather than view?
...swer.
If you think “but I really need this to write my to_csv & to_pdf methods in my model!”, then your entire premise is wrong—after all, you don’t have a to_html method, do you? And yet your object is very often rendered as HTML. Consider creating a new class for generating your outp...