Why do I get different results with row or column vectors when using the ROOTEIG or ROOTMUSIC functions in MATLAB 7.5 (R2007b) ?

When I execute the ROOTEIG or ROOTMUSIC functions in MATLAB, I get different results with row or column vectors.

Answer 1

[MathWorks Support Team]

The ' (apostrophe) is the conjugate transpose operator. What is needed for these two functions to give equal results when using row or column vectors is the array transpose operator: .'

Reproduction steps:

fs = 12;

f0 = 2;

t = ((1:1024)' - 1)/fs;

x = exp(j*2*pi*f0*t) + .1*randn(1024, 1);

% These lines give different results.

fe  =   rooteig(x, 1, fs)

fe1 =   rooteig(x.', 1, fs) % Same result as before.

fe2 =   rooteig(x', 1, fs) % Different result as before.

% These lines give different results.

fm  =   rootmusic(x, 1, fs)

fm1 =   rootmusic(x.', 1, fs) % Same result as before.

fm2 =   rootmusic(x', 1, fs) % Different result as before.