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如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...两种交易系统,就不存在踏空。只存在速度上的不同。 4:控制核心 在交易系统出现信号时期,因为必然存在不确定性,就需要资金管理来将不确定性(我称为风险)降到最大可控程度,这个并不是技术交易系统的内容。假设,一...
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How do I modify fields inside the new PostgreSQL JSON datatype?

... 349 Update: With PostgreSQL 9.5, there are some jsonb manipulation functionality within PostgreSQL ...
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Listing all permutations of a string/integer

... it is tagged c #), from http://radio.weblogs.com/0111551/stories/2002/10/14/permutations.html : Rather lengthy, but I decided to copy it anyway, so the post is not dependent on the original. The function takes a string of characters, and writes down every possible permutation of that exact string,...
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pandas GroupBy columns with NaN (missing) values

...ng the groupby (e.g. -1): In [11]: df.fillna(-1) Out[11]: a b 0 1 4 1 2 -1 2 3 6 In [12]: df.fillna(-1).groupby('b').sum() Out[12]: a b -1 2 4 1 6 3 That said, this feels pretty awful hack... perhaps there should be an option to include NaN in groupby (see this github i...
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JavaScript object: access variable property by name as string [duplicate]

... ThiefMasterThiefMaster 274k7272 gold badges535535 silver badges597597 bronze badges ...
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How do I apply the for-each loop to every character in a String?

... 343 The easiest way to for-each every char in a String is to use toCharArray(): for (char ch: "xyz...
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Advantages of std::for_each over for loop

... 184 The nice thing with C++11 (previously called C++0x), is that this tiresome debate will be settle...
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程序员羊皮卷下载版.pdf - 文档下载 - 清泛网 - 专注C/C++及内核技术

...义 12 计算机专业的学生与IT 培训 12 IT 培训的7 大陷阱 14 大学毕业了,要不要参加IT 培训 17 到底有没有救世主 20 第2 章 四招找到好工作 20 求职中的心理健康问题 20 大专生求职受歧视 21 这世界并不亏欠我们什么 23 求职中...
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获取文件系统映像及恢复删除的数据(FAT文件系统格式描述) - C/C++ - 清泛...

... 2的指数幂,且不能超过 32 Kbytes 。 是 14-15 保留区域占用的扇区数。 是 16 FAT拷贝数。通常是 2 。 是 17-18 根目录的文件数目,在 FAT32格式中它的值是 NULL ,无...
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获取文件系统映像及恢复删除的数据(FAT文件系统格式描述) - C/C++ - 清泛...

... 2的指数幂,且不能超过 32 Kbytes 。 是 14-15 保留区域占用的扇区数。 是 16 FAT拷贝数。通常是 2 。 是 17-18 根目录的文件数目,在 FAT32格式中它的值是 NULL ,无...