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Replace a value in a data frame based on a conditional (`if`) statement
In the R data frame coded for below, I would like to replace all of the times that B
appears with b .
8 Answers
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C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...线性时间的操作。
第28条：正确理解由reverse_iterator的base()成员函数所产生的iterator的用法。
如果要在一个reverse_iterator ri指定的位置上插入元素，则只需在ri.base()位置处插入元素即可。对于插入操作而言，ri和ri.base()是等价的...
Static and Sealed class differences
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Sort've interesting to think of other types, based of this. Like some root class that can be inherited and instantiated, but can't inherit. Not sure why that'd be useful, but still
– AustinWBryan
May 20 '18 at 3:41
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Is there a numpy builtin to reject outliers from a list
...list d and return a list filtered_d with any outlying elements removed based on some assumed distribution of the points in d .
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XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
...if there will be greater demand for this with Google's push toward browser-based apps. I think demand will only grow.
– Courtney Christensen
Jan 31 '11 at 23:54
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How to record webcam and audio using webRTC and a server-based Peer connection
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You can use RecordRTC-together, which is based on RecordRTC.
It supports recording video and audio together in separate files. You will need tool like ffmpeg to merge two files into one on server.
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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...图像】TaifunImage 拓展：图片压缩剪裁处理
【图像】SimpleBase64 拓展：图像Base64编解码传输
【图像】KIO4_Base64 拓展：更强大的图像Base64编解码工具，解码后的图像可写入到文件
【图像】KIO4_AnimatedGif：Gif 动画扩展，可点击，可...
How to calculate the difference between two dates using PHP?
...hp
/**
* Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
* implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
*
* See here for original code:
* http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2un...
Using JSON.NET as the default JSON serializer in ASP.NET MVC 3 - is it possible?
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I implemented this without the need of a base controller or injection.
I used action filters to replace the JsonResult with a JsonNetResult.
public class JsonHandlerAttribute : ActionFilterAttribute
{
public override void OnActionExecuted(ActionExecutedContext...
Webfonts or Locally loaded fonts?
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font-family: "Font Name";
src: url(data:application/x-font-woff;base64,d09GRk9UVE8AACSCAA0AAAAARKwAAQAAAAAiVAAAAi4AAAadAAAAAAAAAABDRkYgAAAIyAAAFCgAABmIK5m+CkdERUYAABzwAAAAHQAAACAAXQAER1BPUwAAHRAAAAQlAAAYAq+OkMNHU1VC ... );
font-weight:400; font-style:normal;
}
Here are my specs:
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