Wavelet Toolbox

Example 3: A Funny One

• load gatlin2
  t = wpdec2(X,1,'haar');
  plot(t);
  % Change Node Label from Depth_position to Index and
  % click the node (0). You get the following figure.
  
  
  % Now modify the coefficients of the four terminal nodes.
  newt = t;
  NBcols = 40;
  
  for node = 1:4
    cfs = read(t,'data',node);
    tmp = cfs(1:end,1:NBcols);
    cfs(1:end,1:NBcols) = cfs(1:end,end-NBcols+1:end);
    cfs(1:end,end-NBcols+1:end) = tmp;
    newt = write(newt,'data',node,cfs);
  end
  plot(newt)
  
  % Change Node Label from Depth_position to Index and
  % click on the node (0). You get the following figure.
  
  
  

You can use this method for a more useful purpose. Let's see a de-noising example.

Example 2: drawtree and readtree

Example 4: Thresholding Wavelet Packets