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Eigenvectors_of_a_linear_operator.gif (480 × 486 pixels, file size: 2.96 MB, MIME type: image/gif, looped, 122 frames, 12 s)

Summary

Description
English: A 2x2 real and symmetric matrix represent a stretching and shearing of the plane. The eigenvectors of the matrix (red lines) are the two special directions such that every point on them will just slide on them.
Date
Source https://twitter.com/j_bertolotti/status/1354822527487340550
Author Jacopo Bertolotti
Permission
(Reusing this file)		 https://twitter.com/j_bertolotti/status/1030470604418428929

Mathematica 12.0 code

points = Flatten[CoordinateBoundingBoxArray[{{-50, -50}, {50, 50}}, 2], 1];
sinstep[t_] := Sin[\[Pi]/2 t]^2;
M = {{1.25, 0.3}, {0.3, 0.7}};
pointstransf = (M . #) & /@ points;
\[Psi] = Eigenvectors[M] // N;
frames = Table[
   ListPlot[(1 - t) points + t*pointstransf, AspectRatio -> 1, PlotRange -> {{-25.5, 25.5}, {-25.5, 25.5}}, PlotStyle -> {PointSize[0.01], Black}, Ticks -> None, AxesLabel -> {"x", "y"}, LabelStyle -> {Black, Bold} , 
    Epilog -> {Red, Line[{-50*\[Psi][[1]], 50*\[Psi][[1]]}], Line[{-50*\[Psi][[2]], 50*\[Psi][[2]]}]}]
   , {t, 0, 1, 0.02}];
ListAnimate[Join[Table[frames[[1]], {10}], frames, Table[frames[[-1]], {10}], Reverse[frames]]]

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

Captions

The eigenvectors are the directions such that every point on them will just slide on them.

Items portrayed in this file

depicts

eigenvectors and eigenvalues

inception

28 January 2021

media type

image/gif

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Date/TimeThumbnailDimensionsUserComment
current14:49, 29 January 2021Thumbnail for version as of 14:49, 29 January 2021480 × 486 (2.96 MB)BertoUploaded own work with UploadWizard

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