From ?cbind:
Data frame methods
The cbind data frame method is just a wrapper for data.frame(...,
check.names = FALSE). This means that it will split matrix columns in data
frame arguments, and convert character columns to factors unless
stringsAsFactors = TRUE is passed.
(I'm guessing 'spectrum' is a data.frame before the code fragment you've shown)
hope this helps,
Tony Plate
Johannes Graumann wrote:
> Why is class(spectrum[["Ion"]]) after this "factor"?
>
> spectrum <- cbind(spectrum,Ion=rep("",
> nrow(spectrum)),Deviation.AMU=rep(0.0, nrow(spectrum)))
>
> slowly going crazy ...
>
> Joh
>
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