御宅暴君 “离散点的数量”在统计里面的术语叫“频数”。用 table()
即可。例:
> x = matrix(sample(c(0:19, 255), 100, TRUE), 10)
> x
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 6 6 19 9 5 255 19 17 255 17
[2,] 12 19 18 10 9 19 15 13 9 14
[3,] 255 9 4 19 6 11 8 17 18 12
[4,] 8 4 3 3 17 19 7 1 2 2
[5,] 16 255 255 255 3 19 12 6 18 3
[6,] 6 10 0 15 2 17 14 2 17 2
[7,] 7 2 19 4 11 15 255 1 14 17
[8,] 3 19 14 14 10 16 16 7 2 10
[9,] 13 13 12 1 19 2 15 12 3 10
[10,] 14 1 9 0 2 3 13 11 2 4
> table(x)
x
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 255
2 4 10 7 4 1 5 3 2 5 5 3 5 4 6 4 3 7 3 10 7
我恰好跟你相反,我对 Python 和 Numpy 一无所知,熟悉 R。