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explain computation of P2(1:L/2+1)

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ARCHANA PATIL
ARCHANA PATIL 2019-2-5
评论： P Sun 2021-6-10
What exacly does P2(1:L/2+1) this
where L is length of signal and P2 is two sided spectrum
P1 = P2(1:L/2+1)

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Omer Yasin Birey
Omer Yasin Birey 2019-2-5
编辑：Omer Yasin Birey 2019-2-5
It takes one more element than half of it. Let's say your array is
P2 = [1 2 5 6 7 8 9];
L = length(P2);
P2(1:L/2+1)
the output of this will be
[1 2 5 6]
Because the length is 7 and (7/2+1) will be 4 (it is 4 because for odd numbers it will round down the result of dividing operation). And it will take until 4th element.
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Omer Yasin Birey
Omer Yasin Birey 2019-2-5
Hard to tell with a single line code. Also after his edit it still seems like he wants to know what syntax does
P Sun
P Sun 2021-6-10
Well, I know neither and it is great to know the syntax part.
This line from intro of fft https://uk.mathworks.com/help/matlab/ref/fft.html

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