Home > sgwt_toolbox > sgwt_adjoint.m

sgwt_adjoint

PURPOSE ^

sgwt_adjoint : Compute adjoint of sgw transform

SYNOPSIS ^

function adj=sgwt_adjoint(y,L,c,arange)

DESCRIPTION ^

 sgwt_adjoint : Compute adjoint of sgw transform

 function adj=sgwt_inverse(y,L,c,arange)

 Inputs:
 y - sgwt coefficients
 L - laplacian
 c - cell array of Chebyshev coefficients defining transform
 arange - spectral approximation range

 Outputs:
 adj - computed sgwt adjoint applied to y

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % sgwt_adjoint : Compute adjoint of sgw transform
0002 %
0003 % function adj=sgwt_inverse(y,L,c,arange)
0004 %
0005 % Inputs:
0006 % y - sgwt coefficients
0007 % L - laplacian
0008 % c - cell array of Chebyshev coefficients defining transform
0009 % arange - spectral approximation range
0010 %
0011 % Outputs:
0012 % adj - computed sgwt adjoint applied to y
0013 
0014 % This file is part of the SGWT toolbox (Spectral Graph Wavelet Transform toolbox)
0015 % Copyright (C) 2010, David K. Hammond.
0016 %
0017 % The SGWT toolbox is free software: you can redistribute it and/or modify
0018 % it under the terms of the GNU General Public License as published by
0019 % the Free Software Foundation, either version 3 of the License, or
0020 % (at your option) any later version.
0021 %
0022 % The SGWT toolbox is distributed in the hope that it will be useful,
0023 % but WITHOUT ANY WARRANTY; without even the implied warranty of
0024 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0025 % GNU General Public License for more details.
0026 %
0027 % You should have received a copy of the GNU General Public License
0028 % along with the SGWT toolbox.  If not, see <http://www.gnu.org/licenses/>.
0029 
0030 function adj=sgwt_adjoint(y,L,c,arange)
0031 
0032 assert(iscell(c));
0033 N=size(L,1);
0034 % first compute adj = W^*y ( sort of slowly )
0035 adj=zeros(N,1);
0036 %fprintf('computing adjoint\n');
0037 for j=1:numel(c)
0038     tmp=sgwt_cheby_op(y{j},L,c{j},arange);
0039     adj=adj+tmp;
0040 end
0041

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