Get Eigenvalue

Allows the extraction of a single eigenvalue from the spectrum of an operator.


  • $ \{ E_n \}$: list of real numbers - the eigenvalues to extract a single value from


  • E: A real number - the eigenvalue extracted from the list


In the text field, the index of the desired eigenvalue has to be input. Note that indexing starts with zero.

Error messages

in addition to input errors, the node shows an error when the desired eigenvalue is not in the list of eigenvalues of the spectrum