Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Group: Mathematical Functions
Topic: Fourier and Wavelet transforms
See also: fwt dwt invdwt fwtin invfwtin fwtinshift fwt2 invfwt2

Function: invfwt
Description: invfwt computes the Fast Wavelet Transformation of a vector.

Link:
Usage: x = invfwt (a, b, n, l, h)
Input:
a l x 2 matrix, indices and coefficients of father wavelet
b (n-l) x 3 matrix, indices and coefficients of mother wavelet
n integer, total amount of coefficients, has to be a power of 2
l integer, the number of coeffients of the mother wavelets
h m x 1 vector, wavelet basis
Output:
x n x 1 vector,

Note:

Example:



library ("wavelet")

x = (0:1023)/1023

{a, b} = fwt (x, 4, daubechies4)

sum (x - invfwt (a, b, 1024, 4, daubechies4))

Result:



Contents of sum

[1,]  1.6205e-12

Group: Mathematical Functions
Topic: Fourier and Wavelet transforms
See also: fwt dwt invdwt fwtin invfwtin fwtinshift fwt2 invfwt2

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

(C) MD*TECH Method and Data Technologies, 21.9.2000