在julia中矩阵的迹怎么计算

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1

使用trace这个函数报错，求解
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2 
julia> using LinearAlgebra
help?> tr
search: tr try triu tril trunc trues triu! tril! trylock tryparse truncate transcode transpose transpose! Transpose Tridiagonal trailing_ones trailing_zeros Ptr strip struct String string stride strides atreplinit

  tr(M)

  Matrix trace. Sums the diagonal elements of M.

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> A = [1 2; 3 4]
  2×2 Array{Int64,2}:
   1  2
   3  4
  
  julia> tr(A)
  5
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3

超级感谢，解决了我的问题！！！