wt = wfbtput(d,k,w,wt); wt = wfbtput(d,k,w,wt,'force');
| d | Level in the tree (0 - root). |
| k | Index (array of indexes) of the node at level d (starting at 0). |
| w | Node, basic wavelet filterbank. |
| wt | Wavelet filterbank tree structure (as returned from wfbtinit). |
| wt | Modified filterbank structure. |
wfbtput(d,k,w,wt) puts the basic filterbank w to the filter tree structure wt at level d and index(es) k. The output is a modified tree structure. d and k have to specify unconnected output of the leaf node. Error is issued if d and k points to already existing node. For possible formats of parameter w see help of fwt. Parameter wt has to be a structure returned by wfbtinit.
wfbtput(d,k,w,wt,'force') does the same but replaces node at d and k if it already exists. If the node to be replaced has any children, the number of outputs of the replacing node have to be equal to number of outputs of the node beeing replaced.
This example shows magnitude frequency responses of a tree build from the root:
% Initialize empty struct wt = wfbtinit(); % Put root node to the empty struct wt1 = wfbtput(0,0,'db8',wt); % Connect a different nodes to both outputs of the root wt2 = wfbtput(1,[0,1],'db10',wt1); % Connect another nodes just to high-pass outputs of nodes just added wt3 = wfbtput(2,[1,3],'db10',wt2); % Add another node at level 3 wt4 = wfbtput(3,1,'db16',wt3); % Create identical filterbanks [g1,a1] = wfbt2filterbank(wt1,'freq'); [g2,a2] = wfbt2filterbank(wt2,'freq'); [g3,a3] = wfbt2filterbank(wt3,'freq'); [g4,a4] = wfbt2filterbank(wt4,'freq'); % Plot frequency responses of the growing tree. Linear scale % (both axis) is used and positive frequencies only are shown. subplot(4,1,1); filterbankfreqz(g1,a1,1024,'plot','linabs','posfreq'); subplot(4,1,2); filterbankfreqz(g2,a2,1024,'plot','linabs','posfreq'); subplot(4,1,3); filterbankfreqz(g3,a3,1024,'plot','linabs','posfreq'); subplot(4,1,4); filterbankfreqz(g4,a4,1024,'plot','linabs','posfreq');