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I need only those graphs whose adjacency as well as laplacian matrices have all eigenvalues integers. but the code after

Integer valued eigenvalues . for G in graphs.nauty_geng("8 -c"): A=G.adjacency_matrix().eigenvalues() L=G.lapla

But it is not coming the correct answer.

Integer valued eigenvalues . for G in graphs.nauty_geng("8 -c"): A=G.adjacency_matrix().eigenvalues() L=G.lapla

Integer valued eigenvalues for G in graphs.nauty_geng("8 -c"): A=G.adjacency_matrix.eigenvalues() L=G.laplacian_matrix.e

Matrices with special spectral property ``` M = MatrixSpace(ZZ,4,4) for A in M: if A.determinant()!=0: p=A.eigen

Matrices with special spectral property M = MatrixSpace(ZZ,4,4) for A in M: if A.determinant()!=0: p=A.eigen

Bicyclic Graphs with fixed girth having highest second smallest laplacian eigen value from a collection for g in graphs.

How to obtain (or generate ) positive semidefinite matrices $A,B,C$ that satisfy the matrix equation $A^3+B^3=2C^3$ usin

How to obtain (or generate ) positive semidefinite matrices $A,B,C$ that satisfy the matrix equation $A^3+B^3=2C^3$ usin

OK, Thanks. Now suppose I want to find the graphs having exactly one perfect matching from the following collection : Co

Thank you. But I am unable to compile your code. Can you please provide all the codes in a single code so that I can com

for g in graphs.nauty_geng('8 -c'):
                    if g.size()==10:
                       A=g.adjacency_matrix()
                       k=A.determinant()
                       show(k)
                       g.show()

Here I am trying to obtain those graph(s) which have exactly one perfect matching and among all those graphs I need to obtain only that graph(s) whose adjacency matrix have highest determinant.

How to find the graphs having exactly one perfect matching from the following collection and whose determinant is maximu

How to find the graphs having exactly one perfect matching from the following collection? for g in graphs.nauty_geng('8

You are correct. I have edited my code now..Can we find now?

How to find the graphs having exactly one perfect matching from the following collection? for g in graphs.nauty_geng(' -

How to find the graphs having exactly one perfect matching from the following collection? for g in graphs.nauty_geng('7

How to find the graphs having exactly one perfect matching from the following collection? for g in graphs.nauty_geng('7