WebDetails. as.data.frame is a generic function with many methods, and users and packages can supply further methods. For classes that act as vectors, often a copy of as.data.frame.vector will work as the method. If a list is supplied, each element is converted to a column in the data frame. Similarly, each column of a matrix is converted separately. Web我试图在数据框中获取最后一个字符或一系列符号的数量,以便我可以在之后过滤一些类别。 但我没有得到预期的结果。 第一种方法: 我期望收到的是: c , , 我真正收到的是: c C , F , Z 然后,我意识到length my df , 是我的数据帧的行数,而不是每个单元格的长度。
R语言添加特殊文本以及annotate()函数的使用小技巧 - 知乎
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stringsAsFactors=FALSE是什么意思_狂奔的蜗牛11的博客-CSDN …
WebWhich package are you using? read.xlsx from the xlsx package does have the stringsAsFactors argument.read.xlsx from the openxlsx package does not have have a stringsAsFactors argument, but it does not automatically convert character columns to factor. There is also read_excel from the readxl package, which also does not convert … Web用read.table和其衍生品比如read.csv read.delim,R会自动把字符串string的列辨认成factor。 比如你有一个全班成绩数据集,第一列名字,第二列性别,第三列语文成绩,第四列数学 … Web在用R语言作图的过程中,往往会在图中指定位置添加自定义文本、线段等,比如ggplot2绘图时常用的geom_text()函数和geom_segment()函数。 此外还有一个非常实用的函数: annotate() ,它能帮我们任意添加文本、线段等,有时候比前两个函数更方便。 dr martin luther king jr march on washington