我的列数等于行数。并且对角线等于零。我该如何构建这个矩阵?
#mat
# [,1] [,2] [,3] [,4]
#[1,] 0 NA NA NA
#[2,] 1 0 NA NA
#[3,] 2 4 0 NA
#[4,] 3 5 6 0
我试过这个
x=rand(4,4)
4x4 Array{Float64,2}:
0.60064 0.917443 0.561744 0.135717
0.106728 0.72391 0.0894174 0.0656103
0.410262 0.953857 0.844697 0.0375045
0.476771 0.778106 0.469514 0.398846
c=LowerTriangular(x)
4x4 LowerTriangular{Float64,Array{Float64,2}}:
0.60064 0.0 0.0 0.0
0.106728 0.72391 0.0 0.0
0.410262 0.953857 0.844697 0.0
0.476771 0.778106 0.469514 0.398846
但我正在寻找这样的东西
c=LowerTriangular(x)
4x4 LowerTriangular{Float64,Array{Float64,2}}:
0.0 NA NA NA
0.106728 0.0 NA NA
0.410262 0.953857 0.0 NA
0.476771 0.778106 0.469514 0
对角线应等于零。