数据选择行或者列

>选择适合您数据问题的数据，在**数据准备**环节是重要的事情。</p> <p>### 1 数据选择行<br /> 数据选择行，理解为选择符合所需的对象或者观测或者样例。</p> <p>代码示范：<br /> “`r<br /> # 加载R包<br /> library(magrittr)<br /> library(dplyr)<br /> # 数据导入<br /> data("mtcars")<br /> str(mtcars)<br /> # 选择所需行<br /> # 1 mpg大于20的观察<br /> mtcars.data1 <- mtcars %>% filter(mpg > 20)<br /> mtcars.data1 %>% head<br /> # 2 cyl为4并且mpg 小于等于22的观察<br /> mtcars.data2 <- mtcars %>% filter(cyl == 4 & mpg <= 22)<br /> mtcars.data2 %>% head<br /> “`<br /> **总结**：利用dplyr包的filter()函数，根据变量的条件筛选所需的观察。</p> <p>### 2 数据选择列<br /> 数据选择列，理解为选择符合所需的属性或者变量或者特征。<br /> 代码示范：<br /> “`r<br /> # 加载R包<br /> library(magrittr)<br /> library(dplyr)<br /> # 数据导入<br /> data("mtcars")<br /> str(mtcars)<br /> # 选择所需列<br /> # 1 选择mpg和disp列<br /> mtcars.data3 <- mtcars %>% select(mpg, disp)<br /> mtcars.data3 %>% head</p> <p># 2 选择mpg,cyl和disp列<br /> mtcars.data4 <- mtcars %>% select(mpg:disp)<br /> mtcars.data4 %>% head<br /> “`<br /> **总结**：利用dplyr包select()函数，选择所需变量。</p> <p>**参考资料：**<br /> 1 https://cran.r-project.org/web/packages/dplyr/vignettes/dplyr.html</p> <p>您在阅读中，关于数据选择行或者列，有什么见解，请评论。<br /> 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%95%b0%e6%8d%ae%e9%80%89%e6%8b%a9%e8%a1%8c%e6%88%96%e8%80%85%e5%88%97/#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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