  Soft, quasilocalized excitations (QLEs) are known to generically emerge in a
broad class of disordered solids, and to govern many facets of the physics of
glasses, from wave attenuation to plastic instabilities. In view of this key
role of QLEs, shedding light upon several open questions in glass physics
depends on the availability of computational tools that allow to study QLEs'
statistical mechanics. The latter is a formidable task since harmonic analyses
are typically contaminated by hybridizations of QLEs with phononic excitations
at low frequencies, obscuring a clear picture of QLEs' abundance, typical
frequencies and other important micromechanical properties. Here we present an
efficient algorithm to detect the field of quasilocalized excitations in
structural computer glasses. The algorithm introduced takes a computer-glass
sample as input, and outputs a library of QLEs embedded in that sample. We
demonstrate the power of the new algorithm by reporting the spectrum of glassy
excitations in two-dimensional computer glasses featuring a huge range of
mechanical stability, which is inaccessible using conventional harmonic
analyses due to phonon-hybridizations. Future applications are finally
discussed.
