Help me understand FFT function (Matlab)

Posted by estourodepilha.com on Stack Overflow See other posts from Stack Overflow or by estourodepilha.com
Published on 2009-01-11T22:09:57Z Indexed on 2010/04/07 4:53 UTC
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1) Besides the negative frequencies, which is the minimum frequency provided by the FFT function? Is it zero?
2) If it is zero how do we plot zero on a logarithmic scale?
3) The result is always symmetrical? Or it just appears to be symmetrical?
4) If I use abs(fft(y)) to compare 2 signals, may I lose some accuracy?

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