# Tag Info

Test your code. "I don't know if my linear algebra routines work or not" is a problem you can solve easily. It is easy to check if you have computed the correct eigenvalues or not; just check that $VDV^{-1}=H$, or if you don't fancy the inversion $HV=VD$. If you are not sure that your individual pieces work, you are walking in the dark. Possibly a hot take: ...