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Change multisignal 1-D decomposition coefficients
Syntax
DEC = chgwdeccfs(DEC,'ca',COEFS) DEC = chgwdeccfs(DEC,'cd',COEFS,LEV) DEC = chgwdeccfs(DEC,'all',CA,CD) DEC = chgwdeccfs(DEC,'all',V) DEC = chgwdeccfs(...,IDXSIG)
Description
DEC = chgwdeccfs(DEC,'ca',COEFS)
DEC.level with those contained in the matrix COEFS. If COEFS is a single value V, all coefficients are replaced by V.
DEC = chgwdeccfs(DEC,'cd',COEFS,LEV) replaces the detail coefficients at level LEV with those contained in the matrix COEFS. If COEFS is a single value V, then LEV can be a vector of levels and all the coefficients that belong to these levels are replaced by V. LEV must be such that 1 
LEV DEC.level
DEC = chgwdeccfs(DEC,'all',CA,CD) replaces all the approximation and detail coefficients. CA must be a matrix and CD must be a cell array of length DEC.level.
If COEFS (or CA or CD) is a single number, then it replaces all the related coefficients. Otherwise, COEFS (or CA, or CD) must be a matrix of appropriate size.
For a real value V, DEC = chgwdeccfs(DEC,'all',V) replaces all the coefficients by V.
DEC = chgwdeccfs(...,IDXSIG) replaces the coefficients for the signals whose indices are given by the vector IDXSIG. If the initial data are stored row-wise or column-wise in a matrix X, then IDXSIG contains the row or column indices, respectively, of the data.
Examples
% Load original 1D-multisignal load thinker % Perform a decomposition at level 2 using wavelet db2 dec = mdwtdec('r',X,2,'db2'); % Change the coefficients of details at level 1. % Replace all values by 0. decBIS = chgwdeccfs(dec,'cd',0,1); % Change the coefficients of details at level 1 and % level 2 for signals 31 to 35. Replace all values by 0. decTER = chgwdeccfs(dec,'cd',0,1:2,31:35); % Compare original and new coefficients for details % at level 1 for signals 31 to 35. plot(dec.cd{1}(31:35,:)','b'); hold on; plot(decTER.cd{1}(31:35,:)','r')
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