Hi!
I'm reading a tab-seperated CVS file with:
test1 <- read.table("data.txt", header=TRUE)
It's in the following format:
Date_Time qK qL vL vP ...
0 30 22 110 88 ...
...
(BTW: It seems to me R shifts the column descriptions by one.)
Anyway, I would like to Fourier-transform one column. So I say:
> fft(test1$vP)
Error in levels(x)[x] : invalid subscript type 'complex'
I guess this is some typing error but I don't know which function I have to use
for conversion.
Some more Info about the data:
> test1$vP[1:10]
[1] 110 108 116 118 114 120 117 111 95 118
166 Levels: - 0 1 10 100 101 102 103 104 105 106 107 108 109 11 110 111 ... 99
> class( test1$vPkw)
[1] "factor"
I would appreciate any hints! Thanks in advance!
Best, Philip
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