Commit 77b2153f by Joseph Weston

### Merge branch 'patch-13' into 'master'

```use the shift-inverse method for finding sparse eigenvalues
in the finite system tutorial.

See merge request !265```
parents 4076779d 4699d600
Pipeline #14170 passed with stages
in 17 minutes and 28 seconds
 ... ... @@ -71,7 +71,8 @@ ham_mat = syst.hamiltonian_submatrix(args=[B], sparse=True) # we only calculate the 15 lowest eigenvalues ev = sla.eigsh(ham_mat, k=15, which='SM', return_eigenvectors=False) ev = sla.eigsh(ham_mat.tocsc(), k=15, sigma=0, return_eigenvectors=False) energies.append(ev) ... ... @@ -105,7 +106,7 @@ + # Calculate the wave functions in the system. ham_mat = syst.hamiltonian_submatrix(sparse=True, args=[B]) evals, evecs = sorted_eigs(sla.eigsh(ham_mat, k=20, which='SM')) evals, evecs = sorted_eigs(sla.eigsh(ham_mat.tocsc(), k=20, sigma=0)) # Plot the probability density of the 10th eigenmode. - kwant.plotter.map(syst, np.abs(evecs[:, 9])**2, ... ... @@ -124,7 +125,7 @@ + # Calculate the wave functions in the system. ham_mat = syst.hamiltonian_submatrix(sparse=True, args=[B]) evals, evecs = sorted_eigs(sla.eigsh(ham_mat, k=20, which='SM')) evals, evecs = sorted_eigs(sla.eigsh(ham_mat.tocsc(), k=20, sigma=0)) # Calculate and plot the local current of the 10th eigenmode. J = kwant.operator.Current(syst) ... ...
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