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how do a plot3 of a wavelet tranform showing time, scale and wavelet coefficients
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Respuesta aceptada
Wayne King
el 14 de Dic. de 2011
Hi Lisa, To use plot3, you must have your time (position) and scale vectors as matrices because the CWT coefficients are in a matrix.
You can use meshgrid() to transform your time and scale vectors into matrices suitable for plot3()
t = 1:1024;
a = 1:30;
Wt = abs(randn(30,1024));
[T,A] = meshgrid(t,a);
plot3(T,A,Wt); xlabel('time');
ylabel('Scale'); zlabel('CWT magnitude');
However, I think you may find surf() better here
surf(t,a,Wt); shading interp;
xlabel('time'); ylabel('scale'); zlabel('CWT magnitude');
Más respuestas (2)
Honglei Chen
el 13 de Dic. de 2011
Hi Lisa,
I don't think plot3 is appropriate for your purpose. I think you probably better off using image or imagesc.
HTH
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Wayne King
el 13 de Dic. de 2011
Hi Lisa, If I remember correctly you are using your own CWT algorithm, not MATLAB's cwt() or cwtft(). Is that correct? Are you coefficients in a matrix scale-position? I think you want surf
load vonkoch
vonkoch=vonkoch(1:510);
len = length(vonkoch);
cw1 = cwt(vonkoch,1:32,'sym2','plot');
% cw1 is 32x510
surf(1:510,1:32,cw1); shading interp;
xlabel('Position'); ylabel('Scale'); zlabel('CWT Coefficients');
colormap jet;
view([-27 42]);
Keep in mind that if you are using a complex-valued analyzing wavelet, you will have to input the moduli (abs()), or the real or imaginary parts.
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