eigentools: A Python package for studying differential eigenvalue problems with an emphasis on robustness

Eigentools is a set of tools for studying linear eigenvalue problems. The underlying eigenproblems are solved using Dedalus, which provides a domain-specific language for partial differential equations. Eigentools extends Dedalus's EigenvalueProblem object and provides automatic rejection of unresolved eigenvalues simple plotting of specified eigenmodes simple plotting of spectra computation of \(\epsilon\)-pseudospectra for any Differential-Algebraic Equations with user-specifiable norms tools to find critical parameters for linear stability analysis ability to project eigenmode onto 2- or 3-D domain for visualization ability to output projected eigenmodes as Dedalus-formatted HDF5 file to be used as initial conditions for Initial Value Problems simple plotting of drift ratios (both ordinal and nearest) to evaluate tolerance for eigenvalue rejection