排序和去重 – 天才代写

>排序为了更好地理解数据，去重删掉重复的观察或者变量。</p> <p>![](http://img.shujuren.org/pictures/VL/5a45082a44e25.png)</p> <p>### 1 排序<br /> 排序，基于某一个变量或者一组变量的值进行有序排列，方便友好地**理解数据**。<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(iris)<br /> iris.data <- iris<br /> iris.data %>% head</p> <p># Sepal.Length 排序操作默认是升序<br /> dplyr::arrange(iris.data, Sepal.Length) %>% head(n = 10)<br /> # Sepal.Length 降序操作<br /> dplyr::arrange(iris.data, desc(Sepal.Length)) %>% head(n = 10)<br /> # 双变量的排序操作<br /> dplyr::arrange(iris.data, desc(Sepal.Length), Sepal.Width) %>% head(n = 10)<br /> “`<br /> **总结**：利用dplyr包的arrange()函数，默认是升序，若是要降序，对变量使用desc()函数。</p> <p>### 2 去重<br /> 去重，去掉重复的行。<br /> 代码示范：<br /> “`r<br /> # 加载R包<br /> library(magrittr)<br /> library(dplyr)</p> <p># 模拟数据<br /> data1 <- data.frame(<br /> id = c(1, 2, 1, 3, 4),<br /> name = c("A", "B", "A", "C", "D")<br /> )</p> <p>data1 %>% print</p> <p># 去掉重复的行<br /> data1 %>%<br /> group_by(id, name) %>%<br /> filter(row_number() == 1)<br /> # 或者<br /> data1 %>% unique<br /> “`<br /> **总结：**利用dplyr包的group_by()和filter()函数进行去重操作或者使用base包的unique()函数去重。</p> <p>您在阅读中，关于**排序和去重**，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%8e%92%e5%ba%8f%e5%92%8c%e5%8e%bb%e9%87%8d/#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" 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