idv2idv

PURPOSE ^

input n = size of matrix (2^n x 2^n)

SYNOPSIS ^

function [out] = idv2idv(n)

DESCRIPTION ^

 input n = size of matrix (2^n x 2^n)
 outputs a transformation matrix for changing from forward to reverse
 order.
 order 1 (Jennie's)
 000, 001, 010, 011, 100, 101, 110, 111
 order 2 (mine)
 000, 100, 010, 110, 001, 101, 011, 111

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [out] = idv2idv(n)
0002 % input n = size of matrix (2^n x 2^n)
0003 % outputs a transformation matrix for changing from forward to reverse
0004 % order.
0005 % order 1 (Jennie's)
0006 % 000, 001, 010, 011, 100, 101, 110, 111
0007 % order 2 (mine)
0008 % 000, 100, 010, 110, 001, 101, 011, 111
0009 %
0010 warning('are you sure you want to call this function?');
0011 
0012 if n <= 0
0013     out = 1;
0014     return;
0015 end
0016 
0017 out = sparse(2^n,2^n);
0018 for i = 0:(2^n-1)
0019     t = dec2bin(i,n);
0020     t2 = t(end:-1:1);
0021     i2 = bin2dec(t2);
0022     out(i+1,i2+1) = 1;
0023 end

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