[R] Non-numeric argument to fft

[Uwe Ligges]

rkevinburton at charter.net wrote:
> I am calling fft and getting a "non-numeric" error:
> 
> +         fit <- lm(Quantity ~ DayOfYear, .sublist)
> +         # Make the time series
> +         x <- as.numeric(rep(0,512))
> +         x <- merge(residuals(fit), x)
> +         # Transform range to -pi - pi
> +         x <- x - pi
> +         x <- x * (2 * pi)/(max(x) - min(x))
> +         fft(x) 
> 
> Error in fft(x) : non-numeric argument
> 
> How can I tell what the non-numeric argument is? There is only one argument.
> 
> What am I doing wrong?


I guess merge() does something different from what you expect and your x 
is a data.frame rather than a vector now....

Uwe Ligges



> Thank you.
> 
> Kevin
> 
> 
> 
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