根据by这列提取非重复的行
uniqueN(dt, by = c("")) 计数非重复的行
> unique(dt, by = c("name"))
d e c name...输出R环境中名为dt的数据框为.csv文件
foverlaps()
foverlaps()
格式
foverlaps(x, y, by.x = if (!...x中寻找有overlap的情况
> x = data.table(chr=c("Chr1", "Chr1", "Chr2", "Chr2", "Chr2"),
+ start...foverlaps(x, y, type="any", mult="first")
⚠️:如果x和y索引的列名称不同时,在foverlaps()内加上一行参数
by.x =c("", "", "")...对应y中列的名称
数据的拆分和合并
melt()
dcast()
> reshape_dt <- data.table(kinds = c(rep("peach", 2), rep("grape",