I'm not in software, but rather algorithm development for determining radio positions (like GPS but including other methods for cell phones). I have used eigenanalysis a number of times, a lot of orthogonal basis shifting of various kinds, implicilty a lot of matrix inversions and pseudoinversions to solve things. I do most of my R&D using matlab, and have learned a lot of linear algebra reading their helpfiles. I use hilbert spaces and what I learned about them 30 years ago almost constantly.
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I'm not in software, but rather algorithm development for determining radio positions (like GPS but including other methods for cell phones). I have used eigenanalysis a number of times, a lot of orthogonal basis shifting of various kinds, implicilty a lot of matrix inversions and pseudoinversions to solve things. I do most of my R&D using matlab, and have learned a lot of linear algebra reading their helpfiles. I use hilbert spaces and what I learned about them 30 years ago almost constantly.