Error using ==> plot

I have a code 

x = rand(64,64,16);
  J = 1;
  [Faf, Fsf] = FSfarras;
  [af, sf] = dualfilt1;T=10;
  w = dualtree3D(x, J, Faf, af);
details = Erry{1}{1}{1};
    energy = sum(sum(abs(details).^2));

then i plotted the graph using plot command

plot(energy)

but i get errror 

   Error using ==> plot
  Data may not have more than 2 dimensions

please help

[Roy Veldhuizen]

Matlab gives an error, saying that Fsfarras is unknown, which indicates that there might be more code that is used in this problem. As such, I'm not able to recreate the error.

My guess is that you're trying to plot a more than 2 dimensions matrix.

plot only accepts m x 1, or 1 x n matrices.

If you want have a 3 dimensional matrix A= [x,y,z] and you want to plot A(x,1,1) versus A(1,y,1)

specify plot(A(:,1,1),A(1,y,1))

I'm not sure if this answers your question, if not, please post more of the preceding code, such that i can reproduce the error.

Answer 1

[Wayne King]

Hi Kash, I think you need to form the complex-valued matrices out of the two DWT trees and then sum the squared magnitudes from all the detail subband matrices. See this example.

x = rand(64,64,16);
J = 1;
[Faf, Fsf] = FSfarras;
[af, sf] = dualfilt1;T=10;
w = dualtree3D(x, J, Faf, af);
for k = 1:7
  coefs = w{1}{1}{k}+1j*w{1}{2}{k};    
  energy(k) = sum(abs(coefs(:)).^2);
end
plot(energy,'b^-','markerfacecolor',[0 0 1])
xlabel('Detail Subbands'); ylabel('Energy');

[kash]

thanks wayne a small doubt the size of coefs is 32x32x8, but size of energy is 1x7,please can u tell about missing subband

[Wayne King]

The "missing" subband is the LLL, which is in the approximation, w{2}

[kash]

ok can we plot that also