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function cofs=d6boxcof
% cofs=D6BOXCOF
%
% Puts all the required coefficients for the 6-tap Daubechies wavelet
% transform on the interval in a structure array.
%
% SEE ALSO: D6BOXSTEP, D6BOXSTEPI, PRECOND6
%
% Last modified by fjsimons-at-alum.mit.edu, 03/15/2010
% disp('Obtaining coefficients')
% Get the product filter coefficients
[h0,f0]=wc('Daubechies',3);
% Get the lowpass (H0) and highpass (H1) coefficients of the ANALYSIS
% Get the lowpass (F0) and highpass (F1) coefficients of the SYNTHESIS
[H0,H1,F0,F1]=prodco(f0,h0);
% Now the special ones for the edges, e.g. from
% http://www.pacm.princeton.edu/~ingrid/publications/54.txt
% http://www.nr.com/contrib/beylkin/D06qmf.txt
% Left, lowpass
% LLO=[ d6h1l1 d6h1l2 d6h1l3 d6h1l4 0 0 0 0; ...
% d6h2l1 d6h2l2 d6h2l3 d6h2l4 d6h2l5 d6h2l6 0 0; ...
% d6h3l1 d6h3l2 d6h3l3 d6h3l4 d6h3l5 d6h3l6 d6h3l7 d6h3l8]
LLO=[ 3.88899763761418e-01 -8.82078282004781e-02 -8.47841308471311e-01 3.49487436741469e-01 0 0 0 0 ; ...
-6.21148317851952e-01 5.22527393204687e-01 -2.00008003001907e-01 3.37867348635904e-01 -3.99770770411862e-01 1.64820129734343e-01 0 0 ; ...
-9.58786377870484e-03 3.71225516842464e-04 3.26009710110353e-01 8.01648164413686e-01 4.72055262027448e-01 -1.40042080963951e-01 -8.54251000994755e-02 3.52196236519723e-02];
% Left, highpass
% LHI=[ d6g1l1 d6g1l2 d6g1l3 d6g1l4]
% d6g2l1 d6g2l2 d6g2l3 d6g2l4 d6g2l5 d6g2l6 0 0; ...
% d6g3l1 d6g3l2 d6g3l3 d6g3l4 d6g3l5 d6g3l6 d6g3l7 d6g3l8; ...
LHI=[ 5.83780969578456e-01 7.93618840200530e-01 1.60955177164887e-01 -5.88417112312549e-02 0 0 0 0 ; ...
-3.49340182426010e-01 2.98920557206519e-01 -3.28301343932461e-01 -3.32263713173123e-01 6.98249720023120e-01 -2.87878999564209e-01 0 0 ; ...
-1.01505899532729e-03 3.93013301879430e-05 3.45143711309844e-02 8.48698103307436e-02 -1.33730702398544e-01 -4.60406454041029e-01 8.06893221779630e-01 -3.32671258977905e-01];
% Right, lowpass
% RLO=[ d6h3r8 d6h3r7 d6h3r6 d6h3r5 d6h3r4 d6h3r3 d6h3r2 d6h3r1; ...
% 0 0 d6h2r6 d6h2r5 d6h2r4 d6h2r3 d6h2r2 d6h2r1; ...
% 0 0 0 0 d6h1r4 d6h1r3 d6h1r2 d6h1r1];
RLO=[3.15093823005453e-01 7.64259199273409e-01 5.20060177812491e-01 7.70293360943509e-02 6.04255818640831e-04 -9.12473562312011e-02 -1.58758215582660e-01 8.18354184018805e-02; ...
0 0 1.91450544225960e-01 4.64362767365511e-01 4.90757830674591e-01 4.96964372120369e-01 4.18999228996535e-01 -2.90407851090693e-01; ...
0 0 0 0 5.89610106858016e-02 1.50987215328402e-01 3.82360655862306e-01 9.09684994311124e-01];
% Right, hipass
% RHI=[ d6g3r8 d6g3r7 d6g3r6 d6g3r5 d6g3r4 d6g3r3 d6g3r2 d6g3r1; ...
% 0 0 d6g2r6 d6g2r5 d6g2r4 d6g2r3 d6g2r2 d6g2r1; ...
% 0 0 0 0 d6g1r4 d6g1r3 d6g1r2 d6g1r1]
RHI=[-1.12367571585129e-01 -2.72547235184810e-01 1.39150326725670e-01 7.59876151023844e-01 1.69441479675110e-03 -2.55869891183398e-01 -4.45179444352116e-01 2.29477548350898e-01; ...
0 0 1.23073831745202e-01 2.98515239695673e-01 -7.67879574290977e-01 -9.81980008912701e-02 5.22394237872772e-01 -1.53505230705603e-01; ...
0 0 0 0 4.07477697635819e-01 -8.04233140972164e-01 4.26562218788225e-01 -7.22194876326683e-02];
% Rearrange the coefficients for the edge calculations
% This is what will happen in D6BOXSTEP to give f(1,2,3,4,5,k+1,k+2,k+3,k+4,k+5)
LFT=[LLO ; zeros(1,4) H0(6:-1:3) ; zeros(1,6) H0(6:-1:5); LHI ; zeros(1,4) H1(6:-1:3) ; zeros(1,6) H1(6:-1:5)];
% Check the orthogonality
difer(LFT'*LFT-eye(length(LLO)),[],[],NaN)
% This is what will happen in D6BOXSTEP to give f(k-4,k-3,k-2,k-1,k,2k-4,2k-3,2k-2,2k-1,2k)
RGT=[H0(2:-1:1) zeros(1,6) ; H0(4:-1:1) zeros(1,4) ; RLO ; H1(2:-1:1) zeros(1,6) ; H1(4:-1:1) zeros(1,4); RHI];
% Check the orthogonality
difer(RGT'*RGT-eye(length(RLO)),[],[],NaN)
% Preconditioning coefficients
% On the left, forward
% HERE WE READ THE COLUMNS DOWN INGRID'S FILE AND THE LABELING SITS WELL WITH BEYLKIN
% LF=[ d6pc1l1 0 0; ...
% d6pc1l2 d6pc2l2 0; ...
% d6pc1l3 d6pc2l3 d6pc3l3];
LF=[ 1.00794157907793e-01 0 0 ; ...
-5.92931024415852e-01 2.13725665320657e-01 0 ; ...
-1.50964976106448e-02 3.06854237778467e-02 1.00018933290722];
% On the left, inverse
% LF=[ d6ipc1l1 0 0; ...
% d6ipc1l2 d6ipc2l2 0; ...
% d6ipc1l3 d6ipc2l3 d6ipc3l3];
LI=[ 9.92120992681742e+00 0 0 ; ...
2.75240372115665e+01 4.67889524872776e+00 0 ; ...
-6.94679698232383e-01 -1.43546705404309e-01 9.99810702932945e-01];
% Check the inverse
difer(inv(LF)-LI,[],[],NaN)
% On the right, forward
% HERE THE LABELING SITS WELL WITH BEYLKIN AND WE READ INGRIDS COLUMNS WITH PERMUTATION THROUGH CENTER
% RF=[ d6pc1r1 d6pc1r2 d6pc1r3; ...
% 0 d6pc2r2 d6pc2r3; ...
% 0 0 d6pc3r3];
RF=[5.64221252452501e+00 -6.66336794227380e+00 2.41778315064289e+00; ...
0 1.73763179569470e+00 -4.65879830148413e-01; ...
0 0 1.05578252781022e+00];
% On the right, inverse
% RF=[ d6ipc1r1 d6ipc1r2 d6ipc1r3; ...
% 0 d6ipc2r2 d6ipc2r3; ...
% 0 0 d6ipc3r3];
RI=[ 1.77235436569129e-01 6.79652000611259e-01 -1.05969449845818e-01; ...
0 5.75495914886965e-01 2.53946179271153e-01; ...
0 0 9.47164755675664e-01];
% Check the inverse
difer(inv(RF)-RI,[],[],NaN)
% Collect all of these filter coefficients into a structure
cofs.H0=H0; cofs.H1=H1;
cofs.F0=F0; cofs.F1=F1;
% Edge coefficients
cofs.LLO=LLO; cofs.LHI=LHI;
cofs.RLO=RLO; cofs.RHI=RHI;
% Combination coefficients
cofs.LFT=LFT;
cofs.RGT=RGT;
% Preconditioners
cofs.LF=LF; cofs.LI=LI;
cofs.RF=RF; cofs.RI=RI;