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Pass a data.frame column name to a function
...cept a data.frame ( x ) and a column from it. The function performs some calculations on x and later returns another data.frame. I'm stuck on the best-practices method to pass the column name to the function.
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How to use git bisect?
...ying that git bisect is awesome. However, I'm not a native speaker and I can't understand why it's awesome.
6 Answers
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What are the underlying data structures used for Redis?
...ange at first: if you are not interested in Redis internals you should not care about how data types are implemented internally. This is for a simple reason: for every Redis operation you'll find the time complexity in the documentation and, if you have the set of operations and the time complexity,...
How do search engines deal with AngularJS applications?
I see two issues with AngularJS application regarding search engines and SEO:
15 Answers
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Fastest hash for non-cryptographic uses?
...at CRC32 will have more collisions than MD5 or even SHA-1 hashes, simply because of the reduced length (32 bits compared to 128 bits respectively 160 bits). But if you just want to check whether a stored string is corrupted, you'll be fine with CRC32.
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SSL certificate is not trusted - on mobile only [closed]
...tml
You should be able to see if there are any issues with your ssl certificate chain.
I am guessing that you have SSL chain issues. A short description of the problem is that there's actually a list of certificates on your server (and not only one) and these need to be in the correct order. If they...
c++ 写日志通用类，可设置日志级别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...evel)
return;
// 设置地域，不然fprintf写不了中文
setlocale(0, "chs");
FILE *fp = NULL;
TCHAR szLogFile[MAX_PATH] = {0};
va_list args;
va_start(args, fmt);
GetCurrentDirectory(MAX_PATH, szLogFile);
SYSTEMTIME sys;
GetLocalTime( &sys );
// 创建Log目录
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选中CListCtrl指定行并发送LVN_ITEMCHANGED消息 - C/C++ - 清泛网 - 专注C/C++及内核技术
...d;
nmlv.hdr.idFrom = m_listReport.GetDlgCtrlID();//GetDlgCtrlId() ;0x00190ca4
nmlv.hdr.code = LVN_ITEMCHANGED;
nmlv.iItem = nIndex ;
nmlv.iSubItem = 0;
nmlv.uNewState = 3 ;
nmlv.uOldState = 0;
nmlv.uChanged = LVIF_STATE;
nmlv.lParam = 0;
m_listReport.GetParent()->SendMessageA(WM_NOTIFY,nmlv...
十张图带你入门Map/Reduce - C/C++ - 清泛网 - 专注C/C++及内核技术
... —— 所属州和城市年度平均温度。比如：San Francisco：{CA，58}。现在你想计算每年的平均温度 —— BY STATE。因为可以通过state对city进行分组查询，然后计算一个州的平均温度而不涉及到其他的州 —— 这里就将会出现高度并行算...
phpcms 启用手机门户（自动判断手机浏览器） - 更多技术 - 清泛网 - 专注C/...
...名管理系统中简析这个域名到你的服务器地址。2、修改 ca...1、确定一个域名作为你手机wap站点的访问域名，例如：http://m.xxx.com 。接下来在域名管理系统中简析这个域名到你的服务器地址。
2、修改\caches\configs\route.php 文件，...