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Aggregate / summarize multiple variables per group (e.g. sum, mean)
...om a data frame, is there a easy way to aggregate ( sum , mean , max et c) multiple variables simultaneously?
8 Answers
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谈谈创业公司技术的工作模式 - 资讯 - 清泛网 - 专注C/C++及内核技术
...这样才能保证高效开发。如果横向切分，一些人研发service、一些人研发dao，一些研发jsp会增加不必要的沟通浪费时间。如果后面项目庞大了，还是建议应该增加一个专业的前端js开发和后台DBA。研发开发好自己的业务代码对功能...
“unpacking” a tuple to call a matching function pointer
I'm trying to store in a std::tuple a varying number of values, which will later be used as arguments for a call to a function pointer which matches the stored types.
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Why are preprocessor macros evil and what are the alternatives?
I have always asked this but I have never received a really good answer; I think that almost any programmer before even writing the first "Hello World" had encountered a phrase like "macro should never be used", "macro are evil" and so on, my question is: why? With the new C++11 is there a real alte...
“Adobe Flash Player因过期而遭到阻止”的内幕起因和解决办法 - 更多技术 ...
...er因过期而遭到阻止”的内幕起因和解决办法Flash真的被Facebook首席安全官斯塔莫斯一句话说中，要不堪重负了吗？今天，小编和很多使用Chrome浏览器的同事都遇到了Adobe Flash Playe...Flash真的被Facebook首席安全官斯塔莫斯一句话说中...
Path to MSBuild
How can I programatically get the path to MSBuild from a machine where my .exe is running?
22 Answers
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What's a monitor in Java?
What's a monitor referred to in concurrent programming in Java?
7 Answers
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创业者：在寻找 不迷茫 - 资讯 - 清泛网 - 专注C/C++及内核技术
创业者：在寻找 不迷茫经历两年创业热潮，中国创业环境出现了新的常态，投资者更加慎重，对创业项目审核要求提高，投资范围也在缩小。这些让一部分创业后来者感到生存“艰难”，但依然无法打消大多数人的创业想法。...
小米360同日竞技：智能手机血战再起 - 资讯 - 清泛网 - 专注C/C++及内核技术
...辑是公司战略以“定位”作为5P的核心。5P包括产品(Product)、价格(Price)、渠道(Place)和促销(Promotion)以及定位(Positioning)。
以定位为核心，制定价格、营销、渠道、产品策略，比如华为的定位是高性价比。
小米的定位是“为发烧...
How can I make git accept a self signed certificate?
Using Git, is there a way to tell it to accept a self signed certificate?
16 Answers
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