column_to_rownames(dat,"a")## 将a列作为行名 002、 dat column_to_rownames(dat,"b")## 将b列作为行名
> df add_column(df, z = -1:1, w = 0) A tibble: 3 x 4 x y z w 1 1 3 -1 0 2 2 2 0 0 3 3 1 1 0 增加一行,还是基于上面生成的df变量。 在最后,增加一行 > add_row(df, x = 99, y = 9) A tibble: 4 x 2 x y 1 1 3 2 2 2 3 3 1 4 99 9 插入第二行,增...
2.1.5 添加新变量（mutate）select_data_add <- select_data %>% mutate(l_per_100km = 235.21...
add_row(a = 3, b = 3, .before = 2) ## 列插入--- dt %>% add_column(c = c(3,3)) #注意前面的c是列名称,后面的c是表示向量 ## --- dt %>% add_column(c = 5) ## ---
##expects a species by site matrix for spXsite, with row names for plots, or optionally plots named in column 1. By default calculates a modification of the Raup-Crick metric (standardizing the metric to range from -1 to 1 instead of 0 to 1). Specifying classic_metric=TRUE instead calcu...
我们可以使用 add_row、add_column 函数,添加观测值、添加 变量。类似于 rbind、cbind 函数,但这两个函数还可以在原数据框的 任意位置插入行列。注意这两个函数是根据 tibble 类型的数据框实现 的,不支持使用行名;此外 add_row 会对列名进行更加严格的检查, 所以需要我们按照列名添加观测值。
with heights given by the values in the vector. If height is a matrix and beside is FALSE then each bar of the plot corresponds to a column of height, with the values in the column giving the heights of stacked sub-bars making up the bar. ...
>CMplot(pig60K,plot.type="d",bin.size=1e6,col=c("darkgreen","yellow","red"),file="jpg",memo="",dpi=300,file.output=TRUE,verbose=TRUE)# users can personallysetthe windowsize and the maxoflegend by:# bin.size=1e6# bin.max=N# memo:add a character to the output file name. ...
Column C1. The column is represented as int in SQL Server, integer in R, and int in the output result set. No type conversion was performed. Column C2. The column is represented as varchar(10) in SQL Server, factor in R, and varchar(max) in the output. Note how the output changes...
数据框是一种代表表格数据的有用方式。A data frame represents a table of data. Each column may be a different type, but each row in the data frame must have the same length 数据的格式如下 公式 R provides a formula class that lets you describe the relationship。下面来创建一个公式 ...