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chansiufung76
Member Posts: **2**

in Matlab

Dear all friends,

I am very new with Matlab. I am currently working on a flow forecasting project. I have a set of water flow data. My professor ask me to do A Trous decomposition for 10 levels. Therefore I use the following Matlab code:

function dwt = FWT_ATrou(x,L);

%

% FWT_ATrou -- Fast Dyadic Wavelet Transform (periodized, orthogonal)

% Usage

% dwt = FWT_ATrou(x,L)

% Inputs

% x 1-d signal; length(x) = 2^J = n

% L Coarsest Level of V_0; L << J

% Outputs

% dwt an n times J-L+1 matrix

% giving the wavelet transform of x at all dyadic scales.

%

% Description

% To reconstruct use IWT_ATrou

%

% See Also

% IWT_ATrou, MakeATrouFilter

%

[lodyadf,dlodyadf,hidyadf,dhidyadf] = MakeATrouFilter('Spline',3);

[n,J] = dyadlength(x) ;

D = J-L;

dwt = zeros(n,D+1);

x = ShapeAsRow(x);

dwt(:,1) = x';

for d = 1:D,

s = dwt(:,1)';

s2 = s;

for j = 1:2^(d-1)

s2 = lshift(s2);

end

dwt(:,d+1) = iconv(hidyadf,s)';

for j = 1:2^(d)

p = lshift(dwt(:,d+1)');

dwt(:,d+1) = p';

end

dwt(:,1) = iconv(lodyadf,s2)';

f = zeros(1,2*length(lodyadf));

f(1:2:2*length(lodyadf)-1) = lodyadf;

f2 = zeros(1,2*length(hidyadf));

f2(1:2:2*length(hidyadf)-1) = hidyadf;

lodyadf = f;

hidyadf = f2;

end;

I have set up my data as X, then I just randomly put a number for L. I am start getting confuse here. Can anyone give me some advices to move forward ? Please.

I am very new with Matlab. I am currently working on a flow forecasting project. I have a set of water flow data. My professor ask me to do A Trous decomposition for 10 levels. Therefore I use the following Matlab code:

function dwt = FWT_ATrou(x,L);

%

% FWT_ATrou -- Fast Dyadic Wavelet Transform (periodized, orthogonal)

% Usage

% dwt = FWT_ATrou(x,L)

% Inputs

% x 1-d signal; length(x) = 2^J = n

% L Coarsest Level of V_0; L << J

% Outputs

% dwt an n times J-L+1 matrix

% giving the wavelet transform of x at all dyadic scales.

%

% Description

% To reconstruct use IWT_ATrou

%

% See Also

% IWT_ATrou, MakeATrouFilter

%

[lodyadf,dlodyadf,hidyadf,dhidyadf] = MakeATrouFilter('Spline',3);

[n,J] = dyadlength(x) ;

D = J-L;

dwt = zeros(n,D+1);

x = ShapeAsRow(x);

dwt(:,1) = x';

for d = 1:D,

s = dwt(:,1)';

s2 = s;

for j = 1:2^(d-1)

s2 = lshift(s2);

end

dwt(:,d+1) = iconv(hidyadf,s)';

for j = 1:2^(d)

p = lshift(dwt(:,d+1)');

dwt(:,d+1) = p';

end

dwt(:,1) = iconv(lodyadf,s2)';

f = zeros(1,2*length(lodyadf));

f(1:2:2*length(lodyadf)-1) = lodyadf;

f2 = zeros(1,2*length(hidyadf));

f2(1:2:2*length(hidyadf)-1) = hidyadf;

lodyadf = f;

hidyadf = f2;

end;

I have set up my data as X, then I just randomly put a number for L. I am start getting confuse here. Can anyone give me some advices to move forward ? Please.

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## Comments

1my email id is maheswaran15@gmail.com If you want you can contact me for further details

Bye

Mahes