A_n

PURPOSE

Takes noiselet measurements.

SYNOPSIS

function y = A_n(x,OMEGA,P)

DESCRIPTION

 Takes noiselet measurements.
 Usage: y = A_n(x)
 x - N vector
 y - M vector 
 OMEGA - M-length vector denoting which noiselet coefficients to use
 P - Column permutation matrix

CROSS-REFERENCE INFORMATION

This function calls:

realnoiselet Real-valued Noiselet Transform

This function is called by:

genAmat

SOURCE CODE

0001 function y = A_n(x,OMEGA,P)
0002 % Takes noiselet measurements.
0003 % Usage: y = A_n(x)
0004 % x - N vector
0005 % y - M vector
0006 % OMEGA - M-length vector denoting which noiselet coefficients to use
0007 % P - Column permutation matrix
0008 
0009 N = length(x);
0010 n = sqrt(N);
0011 
0012 yt = realnoiselet(x(P))/n;
0013 
0014 y = yt(OMEGA);