How to calculate the percentage of energy corresponding to the coefficients of one-dimensional wavelet decomposition ?

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Hi, i read the matlab documentation about how to calculate the energy for 1-D wavelet decomposition and i found that it returns the percentage of energy corresponding to the approximations and details coefficients using this syntax :
[Ea,Ed] = wenergy(C,L)
I want to know how this calculation of percentage for each coefficients is done ? Actually i tried to calculate the energy with my own code using this code
for i=1:1:1283
res=res+cd1(i)*cd1(i);
end
x=res/1283;
D1=sqrt(x);
and i want to know how to calculate the percentage of energy of each coefficients used in this matlab syntax? Thanks

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