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 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.

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