R语言-05根据数据值获取位置

获取矩阵或数据框中等于某个值行号和列号

> a<-matrix(1:10,2)
> a
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    3    5    7    9
[2,]    2    4    6    8   10

> which(a==3, arr.ind = TRUE)
     row col
[1,]   1   2