添加新变量和删除变量

> 添加新的变量和删除变量，辅助解决**衍生变量**设计。</p> <p>![](http://img.shujuren.org/pictures/KW/5a45060dd50d7.png)</p> <p>### 1 添加新的变量<br /> 添加新的变量，既可以用于设计或者衍生新的变量，又可以对原始数据做变换操作。</p> <p>代码示范<br /> “`r<br /> # 加载R包<br /> library(magrittr)<br /> library(dplyr)</p> <p># 数据导入<br /> data("mtcars")<br /> mtcars.data <- mtcars<br /> mtcars.data %>% head<br /> help(mtcars)</p> <p># 添加一个新变量dist，记录10gallon行驶的里程数<br /> dplyr::mutate(mtcars.data, dist = 10 * mpg) %>% head<br /> # 若是只需要设计的新变量<br /> dplyr::transmute(mtcars.data, dist = 10 * mpg) %>% head<br /> “`<br /> **总结：**利用dplyr包的mutate()和transmute()函数可以添加新的变量，前者把新的变量的加入到原始数据集，后者只记录新构建的变量。</p> <p>### 2 删除变量<br /> 删除变量可以看作数据选择列的一种**减法**操作。<br /> 代码示范：<br /> “`r<br /> # 加载R包<br /> library(magrittr)<br /> library(dplyr)</p> <p># 数据导入<br /> data("mtcars")<br /> mtcars.data <- mtcars<br /> mtcars.data %>% head<br /> mtcars.data %>% names</p> <p># 删除mpg变量<br /> dplyr::select(mtcars.data, -mpg) %>% head<br /> # 删除mpg，cyl变量<br /> dplyr::select(mtcars.data, -c(mpg:cyl)) %>% head<br /> “`<br /> **总结：**利用dplyr包的select()函数和对需要删除变量进行减法操作，即可实现变量删除功能。</p> <p>关于R语言更多内容，请阅读[**R系列文章**](http://shujuren.org/article/514.html "R系列文章")。<br /> 想加入数据人圈子，请加微信luqin360。</p> <p>————</p> </div> </article> <div class="tagcloud"><ul class='wp-tag-cloud' role='list'><h3>关键字：</h3> </ul> </div> <div class="col-sm-6 col-box bg-gray-light-2 contact-form"> <div role="form" class="wpcf7" id="wpcf7-f17097-o1" lang="zh-CN" dir="ltr"> <div class="screen-reader-response"></div> <form action="/%e6%b7%bb%e5%8a%a0%e6%96%b0%e5%8f%98%e9%87%8f%e5%92%8c%e5%88%a0%e9%99%a4%e5%8f%98%e9%87%8f/#wpcf7-f17097-o1" method="post" class="wpcf7-form" enctype="multipart/form-data" novalidate="novalidate"> <div style="display: none;"> <input type="hidden" name="_wpcf7" value="17097" /> <input type="hidden" name="_wpcf7_version" value="5.1.3" /> <input type="hidden" name="_wpcf7_locale" value="zh_CN" /> <input type="hidden" name="_wpcf7_unit_tag" value="wpcf7-f17097-o1" /> <input type="hidden" 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