# how does Wenergy for 1-D wavelet decomposition works???

2 visualizaciones (últimos 30 días)
afef el 21 de Jul. de 2017
Comentada: Leandro Robaina Arla el 8 de Feb. de 2019
Hi , i read the matlab documentation about the energy for 1-D wavelet decomposition and i want to know how the calculation works exactly??? because the Syntax used is [Ea,Ed] = wenergy(C,L) so here it use the wavelet decomposition vector c and the formula used in theory is
Which use the details and approximations coefficients . can anyone help me to understand please??
##### 0 comentariosMostrar -2 comentarios más antiguosOcultar -2 comentarios más antiguos

Iniciar sesión para comentar.

Wayne King el 10 de Ag. de 2017
Hi Alef, the Ed output gives the percentage of energy captured by the detail (wavelet) coefficients at each level, while the Ea output is the coarsest scale (final-level) scaling coefficient energy (again as a percentage).
% 4 levels here
[C,L] = wavedec(noisbump,4,'sym4');
[Ea,Ed] = wenergy(C,L);
Ed is 1-by-4, the percent energy captured by the wavelet coefficients from the finest scale to coarsest scale.
Ea is a scalar representing the final-scale scaling coefficient energy.
##### 1 comentarioMostrar -1 comentarios más antiguosOcultar -1 comentarios más antiguos
Leandro Robaina Arla el 8 de Feb. de 2019
Hi, i don´t understand completely.
Ed=(Energy of detail 1,Energy of detail 2, Energy of detail 3, Energy of detail 4).
or is the inverse
Ed=(Energy of detail 4,Energy of detail 3, Energy of detail 2, Energy of detail 1).
thank you for the help

Iniciar sesión para comentar.

### Categorías

Más información sobre Signal Analysis en Help Center y File Exchange.

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by