Help in understanding the Power Spectral Density estimates using FFT

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skrowten_hermit
skrowten_hermit 2020-10-9
评论： skrowten_hermit 2020-10-9
I came across this article in documentation which has this particular line:
psdx(2:end-1) = 2*psdx(2:end-1);
I couldn't quite get why only the indices 2 to last but one is taken i.e, first and last indices are discarded.
It would be great if anyone could help me understand why this is being done.

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Mathieu NOE
Mathieu NOE 2020-10-9
hi
the explanation is just above
Zero frequency (DC) and the Nyquist frequency do not occur twice.
thats why the factor 2 on the psdx amplitude does not apply to indice "1" and "end"

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