julia> Matrix{Float64}(undef, 2, 3)
2×3 Array{Float64,2}:
6.93517e-310 6.93517e-310 6.93517e-310
6.93517e-310 6.93517e-310 1.29396e-320
很奇怪啊!!!
julia> Matrix{Float64}(undef, 2, 3)
2×3 Array{Float64,2}:
6.93517e-310 6.93517e-310 6.93517e-310
6.93517e-310 6.93517e-310 1.29396e-320
很奇怪啊!!!
m, n 不相等的时候,对角线是怎么定义的?
julia> using LinearAlgebra
julia> Matrix{Float64}(I, 2, 3)
2×3 Array{Float64,2}:
1.0 0.0 0.0
0.0 1.0 0.0