Julia LinearAlgebra.Diagonal用法及代码示例

Diagonal(V::AbstractVector)

构造一个以V 作为对角线的矩阵。

另见 diag 、 diagm 。

例子

julia> Diagonal([1, 10, 100])
3×3 Diagonal{Int64, Vector{Int64}}:
 1   ⋅    ⋅
 ⋅  10    ⋅
 ⋅   ⋅  100

julia> diagm([7, 13])
2×2 Matrix{Int64}:
 7   0
 0  13

Diagonal(A::AbstractMatrix)

从 A 的对角线构造一个矩阵。

例子

julia> A = permutedims(reshape(1:15, 5, 3))
3×5 Matrix{Int64}:
  1   2   3   4   5
  6   7   8   9  10
 11  12  13  14  15

julia> Diagonal(A)
3×3 Diagonal{Int64, Vector{Int64}}:
 1  ⋅   ⋅
 ⋅  7   ⋅
 ⋅  ⋅  13

julia> diag(A, 2)
3-element Vector{Int64}:
  3
  9
 15

Diagonal{T}(undef, n)

构造一个长度为 n 的未初始化 Diagonal{T} 。参见undef。