> x <- array(-10:10, dim=c(4,5))
> x
[,1] [,2] [,3] [,4] [,5]
[1,] -10 -6 -2 2 6
[2,] -9 -5 -1 3 7
[3,] -8 -4 0 4 8
[4,] -7 -3 1 5 9
如何将“max(x,0)”应用于每个元素,以便获得此矩阵:
[,1] [,2] [,3] [,4] [,5]
[1,] 0 0 0 2 6
[2,] 0 0 0 3 7
[3,] 0 0 0 4 8
[4,] 0 0 1 5 9