issym(A) -> Bool

Test whether a matrix is symmetric.


  1. Check if a matrix is symmetric:

    julia> A = [1 2 3; 2 4 5; 3 5 6];
    julia> issym(A)

    This example checks if the matrix A is symmetric.

  2. Handle non-symmetric matrices:

    julia> B = [1 2 3; 4 5 6; 7 8 9];
    julia> issym(B)

    It returns false because the matrix B is not symmetric.

  3. Verify symmetry with complex numbers:
    julia> C = [1 2+3im; 2-3im 4];
    julia> issym(C)

    The issym function can handle matrices with complex numbers and still determine if they are symmetric.

Common mistake example:

julia> D = [1 2 3; 4 5 6];
julia> issym(D)
ERROR: MethodError: no method matching issym(::Array{Int64,2})

In this example, the input matrix D is not a square matrix. The issym function can only be used with square matrices. Make sure to provide a square matrix as an argument to issym to avoid such errors.

See Also

Ac_ldiv_B, Ac_ldiv_Bc, Ac_mul_B, Ac_mul_Bc, Ac_rdiv_B, Ac_rdiv_Bc, At_ldiv_B, At_ldiv_Bt, At_mul_B, At_mul_Bt, At_rdiv_B, At_rdiv_Bt, A_ldiv_Bc, A_ldiv_Bt, A_mul_B!, A_mul_Bc, A_mul_Bt, A_rdiv_Bc, A_rdiv_Bt, Bidiagonal, cond, conv2, det, diag, diagind, diagm, diff, eig, eigvals, eigvecs, expm, eye, full, inv, isdiag, ishermitian, isposdef, isposdef!, issym, istril, istriu, logabsdet, logdet, lyap, norm, qrfact, rank, repmat, rot180, rotl90, rotr90, sortrows, sqrtm, SymTridiagonal, trace, Tridiagonal, tril, tril!, triu, triu!, writedlm,

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