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在线服务的黑天鹅 - 资讯 - 清泛网 - 专注C/C++及内核技术
...的原因分析之后，已经4小时之后了。
“墨菲定律”，一位工程师说，“前几天觉得这个地方有些隐患，已经存在一段时间了，打算下周来处理，未料它今天就出了问题……”。墨菲定律是指“凡是可能出错的事必定会出错”，...
大数据能否拯救中国足球？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...要的。现代足球利用摄像头、传感器对球员的跑动速度、位置、控球时间、防御范围、动作细节计算出大量数据，可以评估出比赛的状况，以及每名球员的防守范围，对方球队的空当区等有效信息。通过这些信息，教练员可以更...
JavaScript % (modulo) gives a negative result for negative numbers
According to Google Calculator (-13) % 64 is 51 .
11 Answers
11
...
Ternary operator is twice as slow as an if-else block?
...er this question, we'll examine the assembly code produced by the X86 and X64 JITs for each of these cases.
X86, if/then
32: foreach (int i in array)
0000007c 33 D2 xor edx,edx
0000007e 83 7E 04 00 cmp dword ptr [esi+4],0
00000082 7E 1C...
Drawing an SVG file on a HTML5 canvas
...on to comment on the @Matyas answer, but if the svg's image is also in base64, it will be drawed to the output.
Demo:
var svg = document.querySelector('svg');
var img = document.querySelector('img');
var canvas = document.querySelector('canvas');
// get svg data
var xml = new XMLSerializ...
Convert pandas timezone-aware DateTimeIndex to naive timestamp, but in certain timezone
...2:00', '2013-05-18 13:00:00+02:00'],
dtype='datetime64[ns, Europe/Brussels]', freq='H')
using tz_localize(None) removes the timezone information resulting in naive local time:
In [6]: t.tz_localize(None)
Out[6]: DatetimeIndex(['2013-05-18 12:00:00', '2013-05-18 13:00:00'], ...
What online brokers offer APIs? [closed]
...nslate into multiple platform support though (lots of APIs still require a DLL)
– nall
Sep 15 '11 at 5:04
8
...
How to detect reliably Mac OS X, iOS, Linux, Windows in C preprocessor? [duplicate]
..._WIN32__) || defined(__NT__)
//define something for Windows (32-bit and 64-bit, this part is common)
#ifdef _WIN64
//define something for Windows (64-bit only)
#else
//define something for Windows (32-bit only)
#endif
#elif __APPLE__
#include <TargetConditionals.h>
...
Adding header for HttpURLConnection
...ntials = "username:password";
String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userCredentials.getBytes()));
myURLConnection.setRequestProperty ("Authorization", basicAuth);
myURLConnection.setRequestMethod("POST");
myURLConnection.setRequestProperty("Content-Type", "application/...
Unexpected results when working with very big integers on interpreted languages
... supports arbitrary precision. It will produce the correct answer on 32 or 64 bit platforms.
This can be seen by raising 2 to a power far greater than the bit width of the platform:
>>> 2**99
633825300114114700748351602688L
You can demonstrate (with Python) that the erroneous values yo...