# sorting examples using the mtcars datasetattach(mtcars)# sort by mpgnewdata <- mtcars[order(mpg ...
替换空值: foo lt data.frame day c , , , , od c . , N A , . , . NAs lt foo N A by replace method is.na foo NAs lt TRUE or directly foo NAs lt NA 替换负值为 : 方法一: df df lt 方法二: df lt data.frame a rnorm ,b rnorm ...
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# sorting examples using the mtcars datasetattach(mtcars)# sort by mpgnewdata <- mtcars[order(mpg ...
Merging Data Adding Columns To merge two data frames (datasets) horizontally, use the merge function. In most cases, you join two data frames ...
https://github.com/cardillo/joinery https://blog.csdn.net/weixin_44112790/article/details/95387314 ...
1 向一个data.frame指定列插入一列新数据 1.1 插入一列到指定位置 插到data1末尾 插到第一列 2 向一个data.frame指定行插入一行新数据 2.1 插入一行到指定位置 插入 ...
##直接转 dat_es <- dplyr::mutate_all(dat_e,as.numeric) ## 转换后的数据存入list,再转data.frame data <- as.data.frame(lapply(data_raw[,-c(1:11 ...
渐渐从R转向python数据处理 Doc 文档路径 http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.t ...
x<-data.frame(apple=c(1,4,2,3),pear=c(4,8,5,2)) x # apple pear # 1 1 4 # 2 4 8 # 3 2 5 # 4 3 2 x$banana<-c ...