[R] Weird (wrong?) result for fft
|ng||mo @end|ng |rom gm@||@com
Mon Mar 22 17:17:11 CET 2021
I am plying around with fft function from the stats package.
Running the example that is listed in the documentation:
x <- 1:4
fft(x) #output 1
fft(fft(x), inverse = TRUE)/length(x) #output 2
I was expecting that output 1 and two were the same but I get:
 10+0i -2+2i -2+0i -2-2i
> ft(fft(x), inverse = TRUE)/length(x)
 1+0i 2+0i 3+0i 4+0i
Am I doing something wrong or is there a bug somewhere?
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