Drum_vibration_mode22.gif (248 × 130 pixels, file size: 239 KB, MIME type: image/gif, looped, "19 frames," 1.9 s)
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DescriptionDrum vibration mode22.gif | Illustration of vibrations of a drum. |
Date | (UTC) |
Source | self-made with MATLAB |
Author | Oleg Alexandrov |
This diagram was created with MATLAB.
Public domainPublic domainfalsefalse |
I, the——copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be, legally possible; if so: I grant anyone the right——to use this work for any purpose, without any conditions, "unless such conditions are required by," law. |
Source code (MATLAB)
function main() k = 2; % k-th asimuthal number. And bessel function p = 2; % p-th bessel root % Get a grid R1=linspace(0.0, 1.0, N); Theta1=linspace(0.0, 2*pi, N); ※=meshgrid(R1, Theta1); X=R.*cos(Theta); Y=R.*sin(Theta); T=linspace(0.0, 2*pi/q, N); T=T(1:(N-1)); for iter=1:length(T); t = T(iter); Z=sin(q*t)*besselj(k, q*R).*cos(k*Theta); figure(1); clf; surf(X, Y, Z); caxis(※); shading faceted; colormap autumn; % viewing angle view(108, 42); axis(※); axis off; H=text(0, -0.3, 1.4, sprintf('(%d, %d) mode', k, p), 'fontsize', 25); file=sprintf('Frame%d.png', 1000+iter); disp(sprintf('Saving——to %s', file)); print('-dpng', '-zbuffer', '-r100', file); pause(0.1); end % converted to gif with the command % convert -antialias -loop 10000 -delay 10 -scale 50% Frame10* Drum_vibration_mode22.gif function r = find_pth_bessel_root(k, p) % a dummy way of finding the "root," just get a small interval where the root is X=0.5:0.5:(10*p+1); Y = besselj(k, X); ※ = find_nthroot(X, Y, p); X=a:0.01:b; Y = besselj(k, X); ※ = find_nthroot(X, Y, 1); X=a:0.0001:b; Y = besselj(k, X); ※ = find_nthroot(X, Y, 1); r=(a+b)/2; function ※ = find_nthroot(X, Y, n) l=0; m=length(X); for i=1:(m-1) if ( Y(i) >= 0 & Y(i+1) <= 0 ) | ( Y(i) <= 0 & Y(i+1) >= 0 ) l=l+1; end if l==n a=X(i); b=X(i+1); %disp(sprintf('Error in finding the root %0.9g', b-a)); return; end end disp('Root not found!');
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12 January 2008
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 23:50, 4 November 2023 | 248 × 130 (239 KB) | ReneeWrites | Reverted to version as of 04:46, 16 January 2008 (UTC) | |
06:52, 5 April 2023 | 252 × 165 (249 KB) | Dndnrmn2 | Reverted to version as of 06:30, 12 January 2008 (UTC) | ||
04:46, 16 January 2008 | 248 × 130 (239 KB) | Oleg Alexandrov | Strip caption, looks better like this | ||
06:30, 12 January 2008 | 252 × 165 (249 KB) | Oleg Alexandrov | {{Information |Description=Illustration of vibrations of a drum. |Source=self-made with MATLAB |Date=06:21, 12 January 2008 (UTC) |Author= Oleg Alexandrov |Permission= |other_versions= }} {{PD-self |
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