Question
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.
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Expert Answer
Kshitij Singh
PhD Expert
Answered Aug 13, 2026
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.
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